Warning: Services that are run anonymously have a very poor track record. See the Critisism section for specfic complaints and warnings.
OnionWallet is a scam run by the same person(s) as EasyCoin.net and several other "anonymous" wallet services. Once a wallet address with the service recives a set amount (over 1BTC) the funds will automatically be sent to 1NRMGqPYXwPoAGHiPAMzBgkqCcmgms3hjH. Do not use this service. URL is here only to warn others who might be searching for it.
OnionWallet is a scam! Lost my bitcoin!
WARNING OnionWallet and EasyCoin
bitcointalk - Scam: OnionWallet