(Updated from 8:45 a.m. EDT)

Earnings season entered its second big week, and U.S. corporations are starting Monday in a somewhat subdued fashion, meeting Wall Street's forecasts or topping estimates, here and there, by a penny. After the bell today,

American Express

(AXP) - Get American Express Company Report

is scheduled to report second-quarter results. Last week,

TheStreet.com

took a

deeper look at what to expect out of the credit card and financial services company's numbers.

Earnings Reports & Warnings:

BellSouth's

(BLS)

second-quarter income fell to 52 cents a share, compared with earnings of 56 cents a share, in the year-ago period. Analysts expected the company to earn 52 cents a share.

Check Point Software

(CHKP) - Get Check Point Software Technologies Ltd. Report

earned 33 cents a share in the second quarter, up from 17 cents in the same quarter last year. Analysts were expecting income of 32 cents in the latest quarter. Earlier this month, Check Point lowered its

revenue guidance for the quarter. The top line came in at $142.7 million, up from $90.7 million a year ago.

Colgate-Palmolive

(CL) - Get Colgate-Palmolive Company Report

posted second-quarter earnings of 47 cents a diluted share, matching estimates. The company earned 42 cents in the year-ago period. Sales from continuing operations rose 1% to $2.3 billion.

CSFBdirect

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(DIR)

reported a loss of $12.6 million, or 12 cents a share, for the second quarter, excluding one-time items. The company lost 6 cents a share in the same period last year. Analysts expected the company to lose 10 cents in the latest quarter.

Lexmark

(LXK)

reported second-quarter earnings of 65 cents a share this morning, topping Wall Street's estimates by a penny. The company earned 62 cents a share in the year-ago period, while revenue rose to $987.9 million, up 11% from $893 million last year. But Lexmark

warned that poor demand and stiff competition would put third-quarter earnings below estimates, sending its stock sharply lower.

3M

(MMM) - Get 3M Company Report

posted second-quarter income of $451 million, or $1.12 a share, down from $470 million, or $1.18 a share, a year earlier. Sales fell to $4.08 billion from $4.22 billion. Analysts were calling for a bottom line of $1.11 a share.

Southern's

(SO) - Get Southern Company Report

second-quarter income rose to $270 million, or 40 cents a share, from $256 million, or 39 cents a share, in the same quarter a year ago. Analysts were expecting earnings of 40 cents a share. Sales rose to $2.6 billion from $2.5 billion last year.

U.S. Steel

(X) - Get United States Steel Corporation Report

lost 36 cents a share in the latest second quarter, reversing a profit of 62 cents a diluted share in the same quarter a year ago. Revenue rose to $1.73 billion from $1.63 billion last year. Analysts, on average, expected the company to lose 55 cent a share.

Marathon Group

(MRO) - Get Marathon Oil Corporation (MRO) Report

earned $1.88 a share in the latest second quarter, up from $1.18 in the year-ago period. Revenue rose to $9.12 billion from $8.68 billion in the same quarter last year. Wall Street was looking for earnings of $1.52 a share. Earlier this month,

USX

completed its reorganization into a holding company with two publicly traded companies, U.S. Steel and Marathon.