The best program by far for stick figures is Pivot,
http://www.geocities.com/peter_bone_uk/pivot.html . It's free and has very active forums at all levels. Unfortunately, since it is a 2D program, importing from Pivot into Alice is a bit difficult - you have to import the images as a series of textures for a billboard. See the forum thread.
http://www.alice.org/community/showt...ighlight=pivot for more details and some examples.
A more severe disadvantage of Pivot is that you can't animate or otherwise edit the resulting figures in Alice - you would have to do all your edits in Pivot and then import the edited results.
If your goal is to make simple figures that you can then manipulate in Alice, Gabe's suggestion is probably the best. Smooth Teddy's ability to create objects that can be directly read by Alice is a
major advantage of the program. There is also a companion program, Squirrel, which will let you experiment with animating your objects. One caution with Smooth Teddy - save your work often. It is (as the notes for the program itself say) very prone to crashing.
For you and others that might be interested, two other 2D programs I recommend are EasyToons
http://www.superfundungeonrun.com/easytoon/ (see also
http://conceptart.org/forums/showthread.php?t=52221) and Tales Animator
http://www.dollysoft.com/index.htm . For what you want to do, these are less appropriate choices, but both are very useful programs. (They also have the same problems as Pivot for importing into Alice.)
If you do get some interesting results, I hope you will post them in the forum.