I have tried many todo list before, none of which I have ever stuck with. Today I think I found one that I love. Hiveminder Why do I love it do you ask? XMPP for the win! I am an on the go kinda guy but I don't have a fancy new fangled freedom hating Iphone, I only have a 1st or 2nd gen blackberry. But I do have gmail and gtalk on it. I use gtalk to keep up with the likes of identica, but when signal is weak, gtalk drops. Normally even though signal is to weak for gtalk, gmail still works. So between those two methods I can always post to my todo list. I'm not to worried about not being able to read my todo list at all times because I can always print that out.
Anyway check this command reference out, beautiful! So many great commands, and very easy! Anyway hope you find it useful too.
The thing I love about gtalk via gmail app is that it keeps an archive of unread messages. I don't need to worry about missing anything from Identica because I can catch up when I have the time to read through everything.
That, and I have an unlimited data plan without texting, so it's way cheaper to use XMPP than to get SMS messages.
I'm right there with ya Barry