Which search engines cache the pages they've crawled?

• Ask.com (Teoma) does cache, but very few of its pages
• Yahoo (Inktomi) caches
• MSN Live Search (also used by A9) for all practical purposes does not.
• Google does cache nearly everything
• AllTheWeb.com doesn't have a cache
• Altavista doesn't have a cache

Useful page page:

http://www.antezeta.com/search-engine-cache.html

Dangers of widespread proxy caching (which is distinct from caching for archive or index purposes):
http://www.isoc.org/oti/articles/0198/tewksbury.html

Out of date or are things so bad its down the memory hole?