I usually don't remember hot keys.
Me either! Besides, last time I used a 'hot' key I burned off the fingerprint of my typing finger.
Seriously, though, I'm glad you got paint.net running... it is a handy proggie.
As for other recommendations, I go to majorgeeks.com for most software I try. They feature shareware, freeware, open source and ad supported software. I avoid the ad supported stuff like the plague, but the other categories are okay and safe to use... with all titles being tested prior to being listed.
So yeah, Give them a try.