Does anyone know of a good, free command line utility to convert between image formats?

god i absolutely loathe windows vista... ...any other converters that will actually compile on this s**t platform? all i need is to convert from png to bmp on a commandline utility.

EDIT:
install irfanview

create a batch file (or internal app script) to do the following:

cd %1
md bmp
move /y *.bmp* bmp\
for %%n in (png) do "%ProgramFiles%\IrfanView\i_view32.exe" *.%%n /convert=*.bmp /silent %1
move /y *.bmp* bmp\ 

look those hippies even compiled it for you on the windows platform:

http://imagemagick.org/script/binary-releases.php#windows

and to demonstrate the syntax's power

for f in *.png; do convert $f bmp:$f; done

damn those hippies!

for some reason the binaries wouldn't work under vista, and furthermore the sourcecode would not compile either. bottomline: windows_vista+compatability=crap

i recommend irfanview, use it all the time very easy to use and gets the job done.

bah if it doesn't compile make it. Or at least file a bug report.

chances are all you needed to do was download the platform sdk update from microsoft..
http://www.microsoft.com/downloads/details.aspx?familyid=4377F86D-C913-4B5C-B87E-EF72E5B4E065&displaylang=en

thank you rhican. better yet, install a new OS, whic is what i'll be doing soon.