We just launched a site for keeping up-to-date on the latest releases in video games (and books, music and movies, too) at http://merecal.com/
You can use the site to see what's new and what's coming soon (there are web feeds as well), or you can register to get notified by email when new releases matching your favorite video game publishers become available.
Please have a look and let me know what you think. We just launched two days ago so we're trying to get more people checking it out and spreading the word if they like what they see. :)