For some reason, when I try to add a few games I've bought from Steam to my collection and "now playing list", they never seem to appear in the list. For example, I tired to add Wizorbs (PC) but only the XBLA version appeared on the list, same with Fieldrunners amongst others. Any ideas?

hmm no clue what you exactly mean. is your list only for games recently played? that's what my problem was when i bought my last game, i had to change the list from "recently played" to "all games" to see the new game (no clue about the english version i have everything in german)

The answer is quite simple. In the database of the site only the Xbox Live versions of both games appear. Since the PC versions doesn't "exist" here, you can't add them to your games.

The solution would be to add the PC version of those games in the database, but since that option isn't available due to the creation of the new sites.

You'll have to wait until the day we can do that again.