Currently, I modify the default EurekaLog install to avoid this by creating a .\Source subdirectory, changing (CD) to it, and running these commands:
move *.dcu ..\
move exceptionexpert*.bpl ..\
move dialog.res ..\
This basically leaves just the dcu, bpl and res files - everything else moves to the .\Source directory. You also have to tell Delphi where to find the source files for browsing, so go to:
Tools->Options->Environment Options->Delphi Options->Library - Win32
Then select "Browsing Path" and add the path to the source files, this is also theplace to add a path to debug versions of the DCU files if you want to use some.