Bloody hell - good thread, up my alley this one.
Boojum - Terry is a Small God. I also understand where you are coming from with the likes of Lords and Ladies and The Hogfather. But his latter works are "just Terry - nothing special" IMO. But then I'm a fan of the Witches/Rincewind side. Oh and the Wee Free Men 'Nac McFeegle Swagging Moo Beasty'.
You also mention the Algebraist by Iain M Banks - bloody good but not about the culture.
Budbomber - You hit the nail on the head mate. The Wasp Factory is a classic. As are Whit, Crow Road, Complicity etc, etc. One can never be bored of Iain. Seen him giving a lecture at the Daphne Du Maurier Literary Festival - interesting chap - got me books signed
But it is you mentioning Tom Robbins that gets my attention. Bloody Brilliant! America's finest, barring Neal Stephenson. Still Life with Woodpecker is good, I'll give you that - but what about 'Skinny Legs and all' or 'Even Cowgirls get the Blues'. Not to mention one of my all time favourites 'JITTERBUG PERFUME'. Tom Robbins is a true genius of feeling, emotion and setting, not to mention deviationg from your standard seven basic plots! BOOJUM - You have got to read Skinny Legs and All, and Jitterbug Perfume - I guarantee you'll love them.
Blab m8. His Dark Materials is amazing eh? Based on Miltons Paradise Lost. Classic Kids book that. I love Harry Potter but I loved this more.
D'you get the feeling I read too much!
On to my recommendations not mentioned yet....
Neal Asher - anyone not heard of this amazing new British Sci-fi author? If you've not read (in chronological order) Gridlinked; The Skinner; Line of Polity; Cowl; Brass Man - then you are totally missing out. He releases a sequel to The Skinner called 'The Voyage of Sabel Keech' on Feb 17th and the Spatterjay saga continues. I have mine pre-ordered and paid for.
Neal Stephenson - again a demi-god (my ultimate favourite author just pipping Tolkien). The man writes all sorts. Starting with Sci-fi - Diamond Age (a young ladies primer); Snow Crash; Cryptonomicon (words can't describe the enormity of this one) - present age books like Zodiac and historical fiction like the ultimate trilogy - THE BAROQUE CYCLE (CLASSIC).
Finally I must mention China Mieville and the amazing Perdido Street Station, The Scar and The Iron Council. Brilliant works on the imaginary World of New Crobuzon. Excellent! Even his new short stories book 'Killing Jake' is excellent. (China by the way was once Labours youngest MP)!
Got to stop typing!
Gro.