UPDATE (28/03/2011): This has been fixed in VS2010 SP1: http://www.simonrhart.com/2011/03/unnecessary-context-scrolling-in-vs.html
If you have noticed in VS2010 when right clicking something and displaying the context popup menu. You sometimes get a scrollable menu appear in which you have to use the mouse wheel, or press the up or down arrows that are displayed for this type of menu to see all items in the popup menu.
Sadly turning off this "feature" is not possible as it seems to be a bug: https://connect.microsoft.com/VisualStudio/feedback/details/532806/context-menus-open-in-scrolling-mode-while-there-is-place-to-show-the-whole-menu/?wa=wsignin1.0
If you find this bug annoying enough, please vote on the connect site so hopefully we will get a hot fix rather than having to wait for SP1.