Web cache solutions in 2010

After so many mergers, acquisitions, product line sells and
discontinuing I've lost track of what would be good cache solutions
these days.
Requirements:
1) Transparent caching, every request should be made on behalf(IP
address) of the original request
2) Some kind of easy fail-over; doesn't need to be electrical but it
wouldn't hurt
Added benefits:
3) WAN optimization targeted at web applications would be nice to have
4) TCP satellite acceleration of non-cacheable apps would be nice to have
5) Software-only version (due to high custom taxes, hardware will
always cost more)
Totally useless features:
- Policy control (which seems to be the focus these days)
- Websense or alike integration
- Pointy-Haired-Boss reports (destination websites and so forth)


Bluecoat is one vendor I already identified after some googling, but
comments on its technology are welcom.
Open-source recommendations are welcome as well, provided they target
operation quality dependability.


Tks,
Rubens
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