
As of revision 10143 ( in trunk ), you can now load 32bpp graphics in OpenTTD!!
Links for some read on how it works:
32bpp blitters and renderers
http://blog.openttd.org/?p=15
32bpp on Wiki
http://wiki.openttd.org/index.php/32bpp
If you want to try this new engine grab a copy of a nightly:
http://www.openttd.org/nightly.php
Warning:
Any one who wants to code and use 32bpp graphics already made and available, please first ask permission from the artists in question..
These people have spent a lot of their time creating them and should be give the respect and the credit they deserve for their work

PS.: ON revision 10161, a tool called PNGCodec was added, allowing to modify tEXt fields of PNGs (needed for 32bpp PNGs, to store x_offs and y_offs).
For more information have a look here in PNGCodec Topic: http://www.tt-forums.net/viewtopic.php?t=32684
Have fun..
