We have a few phones we have used with out test Google ID, and they appeared in our account list. Our biggest complaint is about syncing the info what's actually on your phone, and what is not. Some of the apps we had installed didn't show on the Web as installed, but the stranger thing happened when we deleted our test account and master reset the phone. We looked into Android Market online, and these apps still showed as installed.
You want to push new apps to your handset that you just did a master reset on and haven't logged into yet? No problems, Google can do that too, just that they aren't going anywhere, but still show as installed on the Web. We thought that the apps we just pushed are hanging somewhere in the air, waiting to be delivered the second we sign-up again with our Google ID. Alas, we weren't graced with their presence on the handset. We had to log out of our Android Market Web version, sign back in, and then push the apps again. This time everything worked fine.
Other users are reporting problems with OTA installation of apps when you have a custom ROM on your device, but we never expected that to work like a charm either. Overall, Android Market on the Web has its quirks and teething problems, but it is definitely a step in the right direction.
Anybody else having issues with the Web version of Android Market?