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# PNG transparency's great,
but a lot of graphics programs don't compress them well; have a look around for a program called 'pngcrush', which should find the best compression for any given PNG file.

Edit: Incidentally, I managed to reduce the file size of that image by about 10% with it.
(Astatine, Tue 13 Mar 2007, 12:32, archived)
# i normally save as gif, does png give a better transparency?
(I helped save b3ta! SkUG >_O i got a couple of stitches in my eyeball... ow, Tue 13 Mar 2007, 12:33, archived)
# gif's don't do gradients
(I helped save b3ta! Aphex The Mink Snackless, Tue 13 Mar 2007, 12:35, archived)
# 'cuz they're lazy cnuts!!
(I helped save b3ta! PedroHin Come along & ride on a Flantastic Voyage, Tue 13 Mar 2007, 12:36, archived)
# Yeah, PNG compresses gradients of colour like a bastard.
(Astatine, Tue 13 Mar 2007, 12:39, archived)
# PNG does variable (8-bit) transparency and up to 24-bit colour,
GIF does on/off (one-bit) transparency and 8-bit colour, and can do animations.

For the default settings of each format, a GIF will be smaller; however, for larger images a PNG will compress the information of a static GIF better.
(Astatine, Tue 13 Mar 2007, 12:37, archived)
# thank you muchness
:)
(I helped save b3ta! SkUG >_O i got a couple of stitches in my eyeball... ow, Tue 13 Mar 2007, 12:45, archived)
#
*learns*
(I helped save b3ta! Carlossus, Tue 13 Mar 2007, 12:53, archived)
# you can also save as 8-bit PNG though
works just like a GIF (on/off transparency too) except it doesn't do animation, and it's almost always smaller than the corresponding GIF, apart from with really tiny icon-sized images
(I helped save b3ta! plentyofants more ghee, vicar?, Tue 13 Mar 2007, 13:00, archived)