According to the current Wallet service overview of the Litecoin-Wiki there are six online wallet-services (copied from there):
- liteaddress.org - Litecoin address generation tools
- reddit ALTcointip bot - give and receive Litecoin tips from reddit users
- Coinkite - Coinkite is a web wallet with merchant services, Point-of-Sale terminals and debit cards. Sign up here
- CoinWallet.co - Online wallet
- Harborly - Online wallet that can be linked with any US bank account
- HolyTransaction - Online wallet, multi-currency support