What is a good font for web/interactive design?
My personal favorite font for web site BODY TEXT is 12 pt. Verdana (80% black) just because it doesn't look so honking round like Arial. Not that I use Verdana for anything else I design; it's just that you really have to choose one of the universal fonts found on the majority of computers. The secondary font (within CSS) that I choose is Helvetica, I think.
I don't mind serif fonts in larger (headline) sizes, even though I have heard they can be more difficult to read. At larger sizes, I don't think that's much of an issue.