Okay,a simple one.

If I update a skin I made(i.e change some logos,numbers,ect.),when I upload it to LFSW,will everyone get the new version or only those who don't have the skinfile in the skins_x folder,assuming(sp?) I don't change the name of my skin?

everyone who doesn't have a version in LFS/Data/Skins will auto-download the newest

Yep, you need to change the name or those who have already downloaded it will still see the old version and not your updated one.

no they wont, LFS checks the time stamp, if its newer it will download it (even if yours is higher res!)

Quote from Jakg :

no they wont, LFS checks the time stamp, if its newer it will download it (even if yours is higher res!)

I'm fairly certain it doesn't do that.

from LFSW

"When you update your skin just upload it with the same name. S2 checks the file-date of a skin to decide if people should re-download it."