Getting an online Litecoin wallet
It's been reported that ltc wallet is DOWN and people have been scammed. Unfortunately there isn't a reputable online ltc wallet at the moment that I'd trust with a 10 foot pole. The ones that have come are just as quickly gone run by fly by night scammers. You're best off encrypting your wallet with a very secure password and making multiple copies of your wallet file that you store in remote, secure locations if you want to protect yourself from loss should your drive ever die on you.

The other option would be to start an account at an exchange that trades in litecoin and use it as your online wallet. Just be sure to use a well established exchange, of which I'm only aware of btc-e.com