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MacShrine has posted 45 screenshots from Tiger build 8A351, as a directory of images. There is no thumbnail page yet.

Version numbers shown: Mac OS X 10.4 pre-release, Build 8A351 [images 006 and 011], Automator 1.0 (30) [image 041], Dictionary 1.0.0 [image 001], iChat AV 3.0 (v364) [image 027], and Mail 2.0 (693) [images 015 and 028].

Also included are screenshots of Spotlight and selected System Preferences panels.

[Update] Some mirrors: one, two.

[Update 2] MacShrine has added new screenshots and organized them into categories.