As part of TheStreet.com’s efforts to increase its reach to mainstream users, starting this morning readers of AOL’s BloggingStocks will see a new but very familiar name in the list of bloggers: Jim Cramer of TheStreet.com‘s RealMoney.com (NSDQ: TSCM) and CNBC’s (NYSE: GE) Mad Money. Cramer is the test run in a relationship between AOL Money & Finance (NYSE: TWC) and TheStreet.com. Steve Elkes, chief revenue officer and EVP, M&A for TheStreet, said the financial media company will provide content to AOL you can’t find for free anywhere else. That starts with sharing Cramer’s blog, usually behind a paid subscription wall on RealMoney.com. If that works, Elkes said, AOL may get content that won’t even be found on TheStreet.com sites.

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For now, no money is involved. It’s strictly about traffic referrals and sharing content. “We’ll figure out what works,” Elkes explained. “We’ll worry about the rest later.”

One reason TheStreet wants to be closer to AOL: the pending launch of Mainstreet.com personal finance site. TheStreet purchased the URL for less than six figures earlier this year and hopes to launch at the end of 2007 or early 2008. A relationship with AOL could help the new site find a wider audience than the premium users who use TheStreet.com and RealMoney.com—and it could be of use given the increasing competition in the space. FiLife, the personal finance JV from IAC (NSDQ: IACI) and Dow Jones, is supposed to launch in October.