A number of people wrote in with comments, I appreciate the feedback. I'll try to address some of them here briefly...
* Features - I can't stress enough that this is AN EARLY BETA (some of us would have called it alpha). Lots of things are missing. They'll appear in future betas.
* Memory footprint. Yes, it's big. Way too big for a final product. But it's not a final product, it's an early beta, we haven't done any tuning. The footprint will come down.
* Number of processes. We currently run different components as different processes to improve stability for this beta. This will change in future releases (and will help memory footprint as well).
* IE as renderer - we do very strict client-side filtering and run the incoming text through an XHTML converter to ensure a valid DOM, so I think we will be considerably more robust than AIM 5.9's creaky ATE control. In the event that we made a mistake, we have the ability to do server-side filtering as well.
* AIM for Linux... can't say too much now, but most of the Triton code is very portable, and may show up in another form in the future.