I'll just do a top 10:
1. Kenshin
2. Great Teacher Onizuka
3. Trigun
4. Serial Experiments Lain
5. Cowboy Bebop
6. Cowboy Bebop: Knocking on Heaven's Door
7. .hack//SIGN
8. The Irresponsible Captain Tylor
9. Inu Yasha
10. Metropolis