We work with a really large Visual Studio 2008 solution: 261 projects. We're thinking through the different reasons we use the big solution and changes to our development process that would allow the use of smaller solutions. So far we have alternative process steps for everything except one: developer navigation of code is optimal (enhanced with ReSharper, of course) when everything is in one solution.
So, I tried to see if ReSharper would navigate to the Source Code of a Reference if the reference was compiled for Debug, similar to the way Visual Studio debugger will pickup the source code of assemblies outside of the solution. I knew it was a long shot. It didn't. I can't say I'm disappointed. I've used ReSharper for several years and IT'S AWESOME, so having that feature wouldn't have surprised me, but definitely wasn't a "man, how could you not do that?"
Knowing that you guys are brilliant (no, I'm not kissing up -- you've proven yourself with this product), I thought I would mention this for a possible feature in a future release: Allowing navigation to source code of a binary reference if the reference is compiled for debug (and probably requiring the PDB's to be in place). I think it meets criteria for what you guys seem to have as a requirement: it's a natural thing that developers would find as a productivity booster.
If for some reason it already does this and I just failed to find it, please let me know!
NEC Infrontia, Inc.