GMail - You're invited and so is everyone else

Attachments sizes are up to 20MB these days and storage on Gmail is up to 2.8 GB.

From Gmail:

Increased attachment limit-- 20 MB!
Now you can start sharing more of those home videos, large presentations and files you just can't seem to get smaller. We have doubled the allowable attachment size to 20 MB to make your Gmail space even more useful. Learn More

It's a Gmail party and everyone is invited!
You can still invite your friends to enjoy Gmail's spam protection, 2.8 GB free storage and other great features, but now you can also just tell them to visit www.gmail.com and sign up without an invitation.