Parallel build in VS2010
If you have solutions with multiple projects, compile time can increase a lot, but if you have multicore machine you can reduce compilation time using a little trick described in the blog of Scott Hanselman.
In a solution I work with, after a clean of the solution, standard build took 23 seconds to finish, while with this trick the build time is decreased to 14 seconds, so it worth trying it out :).
alk.