Actually the title is slightly misleading.
I have already expressed my undying love for Twitter and indeed use it every day. Incredibly useful, informative if not slightly distracting, it's actually how I start and end the majority of my days. I especially love the lists feature (it's the anal classifying freak in me).
RSS feeds similarly are a regular and convenient feature of my life, greeting me every morning from my iGoogle page. Both of these tools I was introduced to by 23 Things last year and I couldn't possibly do without.
Pushnote however... Errr... I don't see the attraction or point of it. Sorry! It sort of duplicates twitter and RSS feeds without the fun. If any users of Pushnote can convince me otherwise I would happily be converted, but for now, not impressed. Saying that I have signed up, and will probably have a stab at trying to enjoy it over the course of these Things...