A1: There is no limit, so you can "watch" as may as you like for as long as you like.

A2: You can actually access your Cnet Control Panel, of sorts, at any time while logged in by clicking on your username (which links to http://www.cnet.com/profile) in the top right corner of any Cnet-branded site. Download Watch List is the one you'd want in this case.

A3: That is likely an issue with your browser, security software, or privacy software blocking/deleting cookies or blocking Javascript to some extent. *.cnet.com, *.com.com, and *.facebook.com are all required to be unrestricted (do not block or delete scripts or cookies from them) for the login process and subsequent content to load correctly.

Hope this helps,
John


P.S. If you continue to have problems adding a product to your watch list, please post the URL to the product page here and we will take a look at it.