ry032008.pngWe’ve been covering how a wide range of web companies have been looking to raise rounds that value them in the hundreds of millions of dollars. Add another one to the list: Widget company RockYou. According to rumors, San Mateo, Calif.-based RockYou hired investment bank Morgan Stanley to help it raise a round that would value it at up to $400 million.

Just yesterday, we reported that ad network Federated Media may be close to closing a $30 million round that would value it at $200 million. On Monday, we reported that instant message aggregator Meebo was raising a round that would value it at up to $250 million.

A number of web companies that have grown large in the last several years are now looking to raise money, or sell, including RockYou archrival widget company Slide, which closed a $50 million round last December that valued the company at $550 million.

Blogger Kara Swisher additionally reports that RockYou entertained large purchase offers but instead is looking for the right strategic investor. The company has declined to comment on this article.