Nooby question, I know, but I've been fighting with these so called HD converters for the whole night and well, I've seen some crafty people uploading my videos to Youtube in minblowing 1080 HD Quality (all this only using the 800X500 pixels' .SWFfile, I presume.)

Any idea/leads/software that could aid me? (Also, there's a new work/series in progress as we speak, woot).

EDIT: Thanks! I hadn't seen this Swifel Software Newgrounds had released (given my abscence around here), it's an amazing program! Thanks everyone who pointed me in the right direction!