- make an index of available command line tools
	All:
	- imagemagick? *
	png:
	- optipng * (better version of pngcrush)
	- pngnq *  (lossy, better version of pngquant)
	- pngout http://www.jonof.id.au/kenutils
	- pngcrush *
	- pngquant * (lossy)
	- advancecomp/advpng *
	jpg:
	- jpegoptim *
	- libjpeg/jpegtran *
	gif:
	- optipng *
	- gifsicle * (maybe)
* = available in ubuntu

trimage: simple gui for:
optipng for png and gif, jpegoptim for jpeg. both are available in ubuntu as dependencies (our primary platform)