I did struggle quite a lot to install the market, but so far no luck. I actually DO have the market installed, but all downloads fail due to missing components. The trick is to install the vending.apk (i'm at work atm so can't post it), but it will not download, I think it is caused by the Google Framework which is missing. What DOES work is the Applanet market. Also copying APK's from a rooted phone does work if you need a certain app which isn't on the AndroidPIT and Applanet market.
One other thing: next week new firmware will be released for this device improving performance and fixing bugs. I hope this firmware does include the google framework, enabling market installation.
Please also post your experience and achievements on installing the market and other improvements/interesting things. Starting to like the device though: watching videos, playing MP3s and e-reading works well. Replacement of the launcher is recommended, I prefer Launcher Pro