I was blown away by this gem I just saw at PDA 24/7. It's a converter that will transform a site into a pda-friendly format, and keep the settings throughout the site. I don't have time right this minute to play with it extensively, so hopefully someone else here can give it a whirl. Apparently you can control the conversion as well. Check it out:
http://www.accu.org/cgi-bin/access/access
This doesn't save the results in the same way iSilo saves for offline viewing...the value is in on-the-fly conversion while pda surfing. I'll be sure to give this a whirl at Starbucks with my new TH55!