Standards for Design

Hey guys,

I was wondering if someone could help me with dimensions for designs - a few friends have been asking me to design projects for them (ie: a sweatshirt - front & back), and I'm unsure of the dimensions to use for the project. Can someone make a generalized list for these sort of things? (signature, avatar (although these should be known), 8.5"x11", 8.5" x 14", poster, sweat/t-shirt, banner, etc.)

 

For printing it is 300 DPI, but don't be making t-shirt designs in PS. You lose quality since it is a raster object and not a vector object like those used by AI.