It there a way to bring in footage I keyed using Premiere ultra into After effects? I much prefer the ultra keyer over anything native to After Effects CS5.5. If not, how do I export and keep intact the aplha channels from the keyed footage into after effects? Thirdly, if I have to, how do I remiove the black background I get as a result of a default quick time movie file?
You can not export a clip with alpha from PPRO.
Easiest way is just doing the key in Keylight - AEFX ( which is far more powerful and flexible than Ultra Key . As good as it is, it has its limits)
You should be able to export a Quicktime file using the PNG codec and export it with RGB+ Just make sure you double check your alpha settings.