Some might say there are Lot more site about Miniatures, But this link list is more for miniature site "Fantasy-Related" Because there are tons of site about warhammer 40k and Warhammer and things too sci-fi.
So to make your like easier, here's a list of site more Fantasy-Orientated!
Links to manufacturers:
Reaper
Ral Partha
Lance & Laser Models
DragonRune Miatures
Wargames foundry (nice miniature site)
Links to miniature pages:
DAC's Sci-Fi / Fantasy Miniature Page (many Ral Partha pix, Check out his link section)
Minutiae (fantasy miniatures and scenery by Joel Patton)
Thomas Pope's Miniatures Page (nice Gallery)
Ronin Craftworks (Very nice pictures and minis)
Online Miniature painting and modeling Guide (good source)
Other links:
Elfwood (Art Gallery, for those who like fantasy
egroups.com (there is a group called mini-painters, find it and join)