Due to its large collecting area, excellent high frequency performance, and flexible suite of state of the art instrumentation the GBT is a capable and unique instrument for microwave background research. I will discuss two recent campaigns in this area. One, a survey of 3,165 radio sources at 30 GHz, has resulted in the most precise characterization to date of the 30 GHz radio point source foreground, and limits the contribution of standard mJy level AGN to about 1/5 of the arcminute scale excess power seen by the CBI. The second, a measurement of the Sunyaev-Zel'dovich Effect (SZE) in the x-ray cluster RXJ1347-1145, resulted in the highest resolution image of the SZE to date and confirms a previous suggestion that the core of the cluster contains extremely hot (> 20 keV) gas. These results come from MUSTANG, a 64 pixel 90 GHz bolometer array on the GBT and a prototype for a future kilo-pixel class array, the plans and prospects for which I will briefly discuss.