Here are some links that I should've posted a long time ago. Sure, they're all in Japanese, but there's enough English in the menus to navigate to see pictures.

This is an overview site:
http://www.sti.jp/product/previousmodel/index.html

Blitzen 2001
http://www.sti.jp/blitzen/

Blitzen 2002 (for some reason, the flash version doesn't work anymore)
http://www.sti.jp/blitzen2002/no_flash/index.htm

Blitzen6
http://www.sti.jp/blitzen6/

Blitzen 2003
http://www.sti.jp/blitzen2003/

'02 LEGACY S401 STI version
http://www.sti.jp/s401/

'05 LEGACY tuned by STI
http://www.sti.jp/LEGACY/

'06 LEGACY tuned by STI
http://www.sti.jp/legacytunedbysti/

'07 LEGACY tuned by STI
http://www.sti.jp/legacytunedbysti2007/

'08 S402
http://www.sti.jp/s402/

'10 LEGACY tS
http://www.sti.jp/product/ts/

'12 LEGACY tS
http://www.sti.jp/product/legacyts/

'01 FORESTER STI II Type M
http://www.sti.jp/typeM/main.html

'09 EXIGA 2.0GT tuned by STI
http://www.sti.jp/product/exiga/

'12 EXIGA tS
http://www.sti.jp/product/exigats/

'98 IMPREZA 22B STI version
http://www.sti.jp/product/22b/

'00 IMPREZA S201 STI version
http://www.sti.jp/product/s201

IMPREZA WRX STI Prodrive Style
http://www.sti.jp/sti_prodrive/

'02 IMPREZA S202 STI version
http://www.sti.jp/s202/

'04 IMPREZA WRX STi spec C TYPE RA
http://www.sti.jp/spec_c_RA/index.html

'04 IMPREZA S203
http://www.sti.jp/s203/

'05 IMPREZA WRX STi spec C TYPE RA
http://www.sti.jp/spec_c_RA2005/index.html

'05 S204
http://www.sti.jp/s204/

'06 IMPREZA WRX STI spec C Type RA-R
http://www.sti.jp/ra-r/

'08 IMPREZA WRX STI ?STI 20th ANNIVERSARY?
http://www.sti.jp/sti20th/

'10 R205
http://www.sti.jp/product/r205/

'11 S206
http://www.sti.jp/product/s206/

'13 WRX STI tS TYPE RA
http://www.sti.jp/product/wrxstitstypera/

'13 BRX tS
http://www.sti.jp/product/brzts/