300->2400 (now we're cooking)->4800->9600->14.4->19.2->28.8->56k
USR, Courrier, and Hayes were usually the best ones for me. I skipped 33.6 among other upgrades. The Courrier also had that extra punch if you were lucky enough to get one on the other end.
The Unix stuff was pretty pedestrian as far as programs, but on Dos, Windows, Amiga, Atari ST, C64, and some others, some cool programs for connecting. I think on Dos I remember using Terminix and Telix quite a bit, but the names mostly escape me by now.
Anyway, I guess now it's better I don't have to dial with options like *70 or use the various AT codes to get online, handshake, and stay there.