While we don't have access to every graphics program out there - lottery tickets, anyone? - there are some resources available to help resize your layouts for the gallery.
As I'm able to get access to additional programs, I'll update the library and this document.
Irfanview - Free! Simply go to any search engine, and search for Irfanview.
Kodak Easy Share 4.0 - for most Kodak camera owners
Paint Shop Pro 9 - versions 7 & 8 are very close to this, as well.
Photoshop 6.0 or 8.0 CS
Picture It! v.7