I like the look of the site, and I found it to be quite speedy as well.

I use memcache on one of my sites, and never found the need for anything else.

Clearly, you felt there was an opportunity in that space, and maybe there is. But to me it wasn't obvious.

That may be a bit of a stepping stone. you're like memcache but...!

I don't know that 'faster' is the main target (though I could be wrong). Lots of sites seem to be quite happy with memcache. But if you can show a savings of x over memcache due to server resources or speed, etc. you might be on to something.