kindle.amazon.com comes close, allowing you to manage your Kindle library (except you can only see it, not control/change anything) and see your annotations… on purchased content only. Content you’ve put on the device is notably missing. Meaning annotations you’ve placed on ebooks you loaded yourself are still tricky to retrieve/make use of and only available on the Kindle itself.
It was nice for Tom and I to share that InsideRIA, InsideMobile, and 360|iDev are in full force effort mode, coming in rapid succession this summer, starting in July. We’ve partnered with O’Reilly for the first two, and that’s crazy exciting. Tom and I have been working with our Pal Steve at O’Reilly on this idea since mmm well it probably started on the Ebay Town hall patio at the first 360|Flex, yeah it’s been a while in the making. The partnership should really open some door’s for O’Reilly and 360|Conferences.