It's cool that you did this. Not sure that sort of focus works for me but at least you have it for you now ;)

I do have one suggestion anyway: knowing how many tasks remain ahead might be cool. Like a progress bar, or an "i/N" counter.

I was thinking about adding i/N counter, but I decided that it may disturb.

I may add show/hide for this in the next revision.

Thanks for suggestion!

Broken for me -- I can't add a new list of tasks.

http://utasks.idev.lt/lists/4b33dd7e6b2f6b571b000010

EDIT: I was doing it wrong.

clickable link: http://utasks.idev.lt/

what other technologies are you using apart from MongoDB ?

sinatra, heroku and mongoHQ

Weird. I did a to-do list using the same technologies, Sinatra and MongoDB. http://tasks.cfpg.me/

Hehe. Weird things happen.