There is an article on the official ethereum forum about the secure web wallet https://ethereumwallet.org.
If you are interested, you can read that article by following the link below.
It has many screenshots and a noob friendly step by step tutorial.

http://forum.ethereum.org/discussion/3505/review-of-ethereum-web-wallet-and-basic-steps-to-get-you-started-noob-freindly

what happened to this online wallet?

too bad, site looked decent when i saw it initially.. glad i didnt use it and glad to know it wasn't truly secure.

Ants in My Pants