so run them through a MPG encoder
seriously, Fraps probably just saves the file as AVI (dunno...never used it, but AVI files are large iirc so it sounds like it does), you can get apps that will convert AVI to MPG4 or WMA or something nice and compact, you could also set the screenmode to something lower if its for web use (like 320x240) and record that, half the width-height=1/4 the filesize.
Mentor.
PC1:XP, P4 3ghz, 1gig mem, 3x160gig hd`s, Radeon 9800pro, 6 way sound.
PC2: Linux, AMD 2ghz, 512mb ram, Nvidia GeForce4mx, 16 bit SB.
PC3: XP, laptop, intel 2.6ghz celeron, ATI 9000igp, 256mb