I went to the 23 Things blog at http://our23things.infopeople.org/ on the Treo. I can see the postings and the blog roll, so it works very well. Nice and clean.
Thing 2 -Blogger on mobile - you have to "claim" your phone which I didn't want to do because it would incur a cost, but information about blogging through Blogger on a mobile phone can be found at: http://help.blogger.com/bin/answer.py?answer=42448
Thing 20, Youtube. The first page is a warning "Information: YouTube Mobile is a data intensive application. We highly recommend that you upgrade to an unlimited data plan with your mobile service provider to avoid additional charges." Searched for Kirtas (the robotic book scanner) and got "No results for 'kirtas'. Only a portion of YouTube videos are available on mobile at this time. We are working hard to bring you more!"