I upgraded ram to 8Gb and HDD to SSD on my laptop I'm currently using for crunching. Not much more I can really upgrade unfortunately. I tried to upgrade the CPU (T4500) to another socket p CPU I think T99/9800 (can't remember), but I couldn't get the system to post so I had to swap back. That was beginning of the week.
Yesterday I bought a wireless nic and a Xeon x5470 (which I plan to OC) to swap with a Core 2 E6700 on an old Alienware R4 7500 a buddy sold me for $50. Apparently you can convert the Xeon LGA771 to fit a LGA 775 socket with a pin mod. I think it refreshes LGA775 boards.
http://www.delidded.com/lga-771-to-775-adapter/
Today I just ordered a bigger EVGA 650w PSU, heat sink (hyper 212 evo) and 256Gb Samsung SSD for another rig so I can OC my FX-6300 and 270 when I get back home. Looking at maybe getting another used 270 to crossfire in another 6 months or so. Planning to build an Intel rig off 5820K in the next couple months. Waiting for Black Friday and Electronics Monday
All I got for now! More upgrades to come later.