Trick was to get gdiplus.dll. Here's the link to gdiplus.dll
http://www.dll-files.com/dllindex/dll-f … ml?gdiplus
$ cp gdiplus.dll ~/.wine/drive_c/windows/system32
Now install digsby using wine
$ wine ~/.wine/drive_c/Program\ Files/Digsby/digsby.exe

It still doesn't run that smoothly but it should sustain your interest till their native linux client comes out.
Src: Digsby forums
The Linux Blog