I use SPBScreenshot... Real easy to use and you can set it to long press send key if you wish so. I'll look for the post with the file and link it, if I can't find it then I'll just upload the cab.
EDIT:
here you go:
http://forum.ppcgeeks.com/showthread...=spbscreenshot
or direct:
http://freewareppc.com/graphics/spbscreenshot.shtml
Check post #3 by darren.wlsn1 and don't forget to thank him
Also that thread contains more useful information about different screenshot apps.
Btw, there are a couple of threads talking about this already. Just letting you know in case you feel motivated to read:
http://forum.ppcgeeks.com/search.php?searchid=4983910
EDIT: PS. If you need more help with the app be sure to pm me...