By Louis Navellier of InvestorPlace

Penny stock investing can be a great way to diversify one's portfolio during tough economic times. By adding a few aggressive, low-priced stocks you can supercharge your profits. However, penny stock investing can be very risky so I recommend finding bargain stocks with a proven track record. Namely, penny stock investments with earnings growth or strong buying pressure behind shares.

Here are seven low-priced (mostly tech) stocks that have fared very well in 2010 thus far and get my seal of approval. These aren't " penny stocks" per se, but at less than $2 a share all are very affordable and could make profitable additions to your portfolio.