Here's another sign that IPOs aren't quite as dead as people may think:

Kayak Software Corp., the U.S. online travel-information service provider, filed for an initial public offering worth as much as $50 million...Kayak, started in 2004, lets shoppers looking for flights, hotels and vacation packages search multiple travel sites, such as those of Expedia and Orbitz, at the same time. Kayak's sales climbed 48 percent to $128.3 million in the nine months through Sept. 30. The online travel market generated $216 billion in sales last year, the company said.

Kayak was co-founded by the customer service-obsessed Paul English. Bloomberg notes that there have been 30 technology IPOs so far this year, up from just 11 for the same period last year.