All,
While browsing some Chinese forums I came across quite some nice things
400+ nice icons in PNG format:
http://www.bi-design.nl/mpx/Icons.rar
20+ nice 320*240 menu images (9 each):
http://www.bi-design.nl/mpx/templates_320x240.rar
And also what seems a new version of LogoDIY, I took the liberty to translate it to English

:
http://www.bi-design.nl/mpx/logodiy23eng.rar
I've also found a tool called
ReadAsBmp which seems to offer similar features as RKLogoEdit, but it's in English by default
Please be aware that the .NET 2.0 FrameWork is required! The file RM100_ROMIMG.TXT contains the offsets for the images (similar to the .lst files for RKLogoEdit)
English .lst files for RKLogoEdit C260 firmware (1.09.0007 and 1.09.0009) can be
found here.