Just wanted to post some of what I've seen...
Netflix does not work in x64, when I click on netflix it just takes me back to the internet videos list...i think this is a limitation of the netflix software only being able to run in 32bit IE.
Also, when adding a network source, after entering the username and password of the remote machine....mousing over 'confirm' does nothing.... for whatever reason, you have to run your mouse over the 'cancel' button.
Once you mouse over the 'cancel' button, the 'confirm' button highlights. To confirm the options, you actually have to click cancel.
The alpha client looks awesome, these are the only 2 bugs i've noticed so far. Thanks for all your hard work!