I changed my Google Account password, and now there's a notification about trouble logging into my Gmail account on my Samsung Galaxy S. That's fine, I'd expect that. What I don't expect is a pop-up box containing a CAPTCHA, that I cannot get past. I'm sure I got at least one of them right (despite the auto-caps for start of words tripping me up a few times). It just keeps popping up with another CAPTCHA. What's going on?

When I first set up my Xperia 10 (running Android 1.6) I selected a 'dummy account', not knowing that it might be somewhat difficult to change it afterwards to a real account (I wasn't warned). I want to avoid hard resets or losing too much data. Is there a recommended procedure for this case?

I no longer want to link my default Google Account on my phone. I have a Nexus One runnin 2.2.1. How can I unlink my Google account?