It's been a while since I've linked to this, but I've seen some questions lately about what file format to use to get such-n-such geometry from one program to another. I spent a lot of time a couple of years ago researching exactly that.
Download a free copy of my 3d File Format Cheat Sheet (PDF) for the best ways to get your files from one 3d modeling program to another when you sign up for the Method Newsletter.
You can learn more about the Cheat Sheet here and signup for the newsletter from that page or by clicking here.
You can always contact me with ideas for additional programs you use a lot that you think should be on the list, or if there's a better file format alternative since I published it.