For those of you with EVDO cards and an Intel-powered Mac, you may be interested in reading this very detailed article over at EVDOinfo.com. It explains how to set up your Mac such that Parallels Desktop can use the EVDO connection to access the internet. There's also an associated forums thread with a few more notes.
I don't have an EVDO card yet, but I've bookmarked the page for future reference. If someone has one and can confirm the procedure, please post a comment.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20061227071620481