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The Germans have finally conquered America ... with dialysis machines, Jim Cramer told viewers of his "Mad Money" TV show Friday.

And that's why he believes it's a good idea to take a look at

Fresenius Medical Care

, a stock he said he would rather buy in Germany than in the U.S., where it's thinly traded

(FMS) - Get Report

.

Medicare can now spend more on dialysis treatment, one segment of its coverage that has not been automatically indexed to inflation and consequently didn't get boosted each year.

And no matter how you cut it, Cramer said, this decision will automatically put money into Fresenius' pockets because it is a perfectly vertically integrated dialysis company that makes the products and provides the services necessary to deal with kidney failure.

It will make more money now that the government is paying more for dialysis, he said, adding that it's also a play on aging baby boomers. Whether or not this demographic has more kidney problems than the preceding generation, he pointed out that boomers comprise a huge portion of the population so there will be more people with kidney problems.

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Even though the company took on $500 million in debt for an acquisition, he said, it took on a growth business with quick payback to debt. So in this case he would overlook the debt.

He also said that he believes

DaVita

(DVA) - Get Report

is a good stock, and that it would be OK to buy it along with Fresenius.

Props for InfraSource

While Cramer usually mocks analyst calls, he said that Friedman Billings Ramsay came out with an upgrade on Friday that he would actually listen to.

The analysts at Friedman upgraded

InfraSource Services

(IFS) - Get Report

to outperform from market perform. The company provides construction and support for power, pipeline and telecom industries.

Cramer said that the $17 stock was spun off of the utility company

Exelon

(EXC) - Get Report

, and that of its three businesses he is most excited by its power business.

He said the telecom and pipeline businesses are strong, but that the power business will benefit from the 2005 energy bill.

We have a "pathetically underinvested power transmission grid," he said, adding that from 1975 to 1999 spending on the electric transmission system actually fell.

Cramer said he believes that InfraSource will make some mad money when the grid is beefed up.

The Bounty in Bonds

Just because bonds are strictly for boring retirement money, that doesn't mean they can't make you some money, Cramer said.

The Treasury introduced the 30-year bond yesterday, a boring story that you probably heard a lot about, he said. And the way to make money off of the return of the 30-year is by buying

CBOT

( BOT), the nation's leading futures exchange.

This is the first 30-year auction since August 2001, which means that the 30-year futures contract will trade again for the first time in as long, Cramer said.

The 30-year futures contract to will be traded to bet on interest rates, and CBOT makes money off of each trade, he said.

This is not a play on the direction of bonds, Cramer said, but on the increased volume of trading around bonds.

The stock is great even without the return of the 30-year, he said, because there's a bull market in trading that is boosting all of the exchanges.

Mad Mail

Cramer also opened the "Mad Money" mailbag. A viewer wanted to know if the expensive fees charged by

optionsXpress

( OXPS) would hurt or help the stock.

Cramer said that when he was trading options, which is full of risk, he cared more about execution than he did about how much or little he paid for a trade. His sources tell him that optionsXpress has good execution, which is why he likes it despite its high fees.

He told another viewer that

Benetton Group

(BNG)

, which he had recommended as a play on the Olympics, has gone up a "monstrous amount," and that now it's time to ring the register.

And even though there's news that LED-based light bulbs are supposed to replace our existing bulbs, Cramer said that he would not buy

Cree

(CREE) - Get Report

as a play on the trend.

He told the viewer that if he wanted a tech stock that he'd look at

Broadcom

(BRCM)

.

Lightning Round

Cramer was bullish on:

NMT Medical

(NMTI)

,

Hershey

(HSY) - Get Report

,

JDSU

(JDSU)

,

Canon

(CAJ) - Get Report

,

Conexant

(CNXT) - Get Report

,

Acadia Pharmaceuticals

(ACAD) - Get Report

,

Kinder Morgan

(KMI) - Get Report

,

Dow Chemical

(DOW) - Get Report

,

Yahoo!

(YHOO)

,

TJX Companies

(TJX) - Get Report

,

Sears Holdings

(SHLD)

,

Amphenol

(APH) - Get Report

,

Digene

( DIGE),

Nabors

(NBR) - Get Report

,

PepsiCo

(PEP) - Get Report

and

Procter & Gamble

(PG) - Get Report

.

Cramer was bearish on:

Click Commerce

( CKCM),

Amazon.com

(AMZN) - Get Report

,

Knot

(KNOT)

,

Ciena

(CIEN) - Get Report

,

Black Hills

(BKH) - Get Report

,

Huntsman

(HUN) - Get Report

,

ValueClick

(VCLK)

and

Coventry Health Care

( CVH).

For more of Cramer's insights during the Lightning Round, click here.

Want more Cramer? Check out Jim's rules and commandments for investing from his latest book by

clicking here

.

As originally published, this story contained an error. Please see

Corrections and Clarifications.

At the time of publication, Cramer was long Procter & Gamble, Sears Holdings and Yahoo!.

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