Well, I'm starting on a Glide graphics plugin. I'd be glad to help when I can. Start out by emulating the 2d frame buffer, it's the easiest thing to do. You may have to look at the CFB plugin source to find the pixel format to use. Once you have that done, most 2d demos should work. Try some at:
http://under64.tripod.com/romdemos.html
Take a look at the messages on Emu Coding about my glide plugin, you may find some information there.
Dextrose has a lot of N64 documents, you may find some of them useful:
http://www.dextrose.com/dx_section_a9t.htm
I hope I can help you. My ICQ number is 24553273. I suggest you get ICQ if you don't have it already. You may want to keep it in 'away' mode so that it does not interrupt your fullscreen testing, though.
Oh, and by the way, if you need me to show you my glide plugin source so far (for 2d), I'd be more than glad to give it to you.