[Tadao]

Small Gods was the first one I read. Not a good first start but I was lucky enough to have bought Reaper Man and Wyrd Sisters at the same time as Small Gods.

I'm not saying that Small Gods is the sux, It's just to dry for an introduction to Pratchett.

My all time favs? Hmmm. I guees the ones that stick out the most is,
Hitchhikers Guide (Entire withought the very very last one)
Fear and Loathing in LV
I guess 3rd is a toss up.

EDIT: 3rd would be anything by Homer.