I'm sorry for your frustration. You saw our compatibility list, right? When you go to our quick start guide and choose section 1: Picking the right components there is a link. Also from the home page under Support, there is a link. That lists the home automation components we know will work.
Regarding Web pads and PDA's, the web pads shown on our site are DTResearch.com DT368. There's also a lower-cost DT375. We didn't mention specific web pads or pda's because pluto runs on all of them. It's a matter of balancing the features you want: battery life, cosmetics, speed and price. We like the DT368/375 because they are designed for OEM use (no logos), they're small and light and ergonomically appealing. The only drawback is the batteries aren't so good. They have a memory effect and need replacing every few months.
For pda's, we've tested lots of them. However, the market life of pda's is so short, and models are replaced every few months, it's impossible to stay on top of which model is currently the best. Probably a source like zdnet would have the latest reviews of the new models. In-house we used Dell Axim's.
Starting next month a system builder will start offering hardware with Pluto pre-installed.