You should talk to Chaotic - he's probably the most knowledgeable here about who's who in WSB, MotoGP and AMA. He'll get you up to speed pretty quick...
I updated the original links (1920 x 1080 ones) to reflect that the WSBK India round was moved from March to November. I'll do the 1280 ones soon. I also added a Kawi one here: http://www.latebraker.com/wallpaper/roadracing_2013_kawi.jpg Here's a smaller preview of it:
Glad you like them! The 1280 x 1024 ones have been updated to reflect the changed date for the India WSBK round as well. Also, I added a couple more of the 1920 x 1080 ones: Hayes_Young_Hayden Oops Here are smaller previews of the new additions:
All of the wallpapers have been updated to reflect last week's changes to the WSBK schedule - the "TBA" round on June 23 went away, and they added a round in Istanbul, Turkey, on September 15. Enjoy! All are here: http://www.latebraker.com/wallpaper/