When building a bitcoin app, its usually a good idea to first test it on testnet, until all issues are ironed out. No point in losing mining fee on test transactions, right?
Since there's a lack of testnet web wallets, we put together http://testnetwallet.com as a quick-and-dirty weekend project, to help you while you're testing that app you're building, or if you just want a quick testnet wallet to interface with a testnet service.
On the homepage there are a few testnet resources listed. If you know any others we can add to the list let us know! Any games running on testnet out there?
Any feedback is welcome!
http://testnetwallet.com
Note: The site is meant as a wallet to help you with testing, not a secure place to store your testnetcoins (as worthless as they may be)