I have an account with bitcoinwallet.com.  I only set it up because I was able to set my username to be "username" (same thing with onename/support).  I don't use it for anything, but I have gotten a couple payments for $25 with a Blockchain wallet ID in the comments.  I though it was someone trying to mix them up, but I couldn't figure out how to send BTC to the wallet ID without a Bitcoin address.

Any ideas?  Otherwise I'm just going to keep them and enjoy watching my wallet grow.