At long last we’re getting ready for Facebook’s IPO later this month. So who else from the latest bumper crop of IPO candidates has some impressive results to boast?

The market for venture-backed IPOs has been pretty dead so far this year. But based on new filing activity, it looks like there’s some optimism things will improve. At least six venture-backed companies have filed to go public since the start of the year, in sectors ranging from enterprise software to semiconductors to car rentals. [...]

Millennial Media, a Baltimore-based provider of mobile advertising solutions, has acquired San Francisco-based mobile analytics firm TapMetrics. No financial terms were disclosed. Millennial Media has raised around $37 million over three rounds of VC funding, from Bessemer Venture Partners, Columbia Capital, Charles River Ventures and New Enterprise Associates.

Michael Avon has joined Millennial Media as executive vice president and chief financial officer. He previously was a principal with Columbia Capital. Millennial is a Baltimore-based provider of mobile advertising solutions, which recently raised $16 million in Series C funding from firms like Columbia, New Enterprise Associates, Bessemer Venture Partners and Charles River Ventures.

Millennial Media, a Baltimore-based provider of mobile advertising solutions, has raised $16 million in Series C funding. New Enterprise Associates led the round, and was joined by return backers Bessemer Venture Partners, Columbia Capital and Charles River Ventures.