From the AMS:
The American Mathematical Society, with support from a private gift, is now accepting applications for travel grants in partial support of attendance by graduate students at one of the fall, 2011 AMS Sectional Meetings. Applications will be accepted through April 15, 2011. Applications for any one of these four sectional meetings will be accepted and considered as a group. Notifications of awards/declines: early June, 2011. This program accepts applications from current full time doctoral students.
Application deadline is April 15, 2011. See the web page for details and instructions.