I am a big fan of the Evernote application and service because it lets me works across all platforms and mobile devices. I just received word that they have just passed their 1 millionth note milestone and to celebrate they are having instant beta account access (no invite needed) for today only (24 April) from now until 9 pm Pacific Daylight Time. Check out their blog post for the secret URL to sign up.
I also have been given lots of Evernote invites so if you do not get in on this offer today, feel free to email me at palmsoloATgmailDOTcom and I'll give out invites until I run out.
They continue to work on the product during this beta period and improvements roll out regularly so now is a good time to participate and offer your feedback on what else they can do to make it even better.