I installed RTM for Gmail and the tasks showed up, but I had a problem entering new tasks. I would type out the task and hit enter with no response.

I finally hit SHIFT-ENTER and it worked. Not sure if this is a bug but wanted to share this knowledge for those who needed it. Wonderful application!

(I did a quick search on the forums and all documentation, but couldn't find the solution. I apologize if this exists somewhere.)