Short answer: it depends.
We still do most of our projects in Drupal 6, mainly because it's been around a few years, and modules we use on many sites are not yet stable for Drupal 7 (and some are still a ways off).
Damon Cortesi ( @dacort ) over at Untitled Startup recently wrote up a summary of recurring payment services provided for startups.
Planning a vacation is tough. Between the pain of finding a hotel or final destination, booking an airline, and locating information on things to do, one could spend days online surfing from website to website searching for items that may or may not be correct and/or relevant.
