I know at least a few people around here are pretty talented with digital graphics and I'm hoping you might have some good suggestions for relatively cheap (read: preferably free) programs to create graphics.

I'm a math/accounting student so my main use would be creating infographics and such. More specifically would be used for my senior research/thesis/poster session on baseball statistics. Hopefully whatever I learn from this I can use going forward and maybe share some stuff on here.

I mostly use a mac, but I have access to a windows 7 laptop and have been thinking about creating a partition for my mbp. So either platform would work, but I would like something fairly user friendly with decent tutorials (forums, youtube videos, books, etc.). Any help would be great.

Rally Bug for your time

(Photo credit: GIS)