If you mean Cache the product, I've never seen either of the products I know with that name discussed here.
One Cache is an object-oriented product from Intersystems. The folks that love Cache really love it, but the rest of the world either has never heard of it, or doesn't really care about it.
The other Cache is a truly relational (as in relational algebra) product, that isn't released to the public yet. Discussions about it should be confined to the private newsgroups until after the product release date, which is still quite some time off.