Just got it and it came with 2.1 and the Market already installed, went to the site once and was browsing and haven't been able to open it since. Says network error and to try again or cancel...
I am getting the same issue, it worked fine for a couple of days and now doesn't. My son who has an Android phone tells me a new version of market was rolled out yesterday, I wonder if this is anything to do with the failure?