I recently started developing a site called Gamingbetas with the purpose of having one specific place where someone will be able to
get informed about upcoming and active betas in the gaming world, while
maintaining the site as clutter-free as possible.
If you visit the site you will notice a skew towards AAA games, which is not
really intentional, but as you can imagine, it's much easier finding out info
about new titles by bigger companies than it is for indie studio games.
So you have a game that you want showcased on the site, or
if you have some feedback to share, contact me at firstname.lastname@example.org or use the "Submit a beta" link on the top right of the site.
Edit: Added link to the site!