How do I run multiple proxies at once?
 

I was curious if there's any immediate and easy way to run multiple proxies at once, I often do spot checks on SERPS in different geographic locations.

Any tips?

you need to be a pimp...

Why would you do spot checks on SERPs this way? There are better ways to get your SERP... Whatever.
You can do this with multiple profiles in firefox or with proxy switchy extention for chrome/chromium. I suggest you try proxy switchy. It is easier to setup and manage.

geosurf.com has a good tool for this..