Recently I did a roadtest review on the Tektronix MDO3000, if you haven't seen it, please check it out at:
http://www.element14.com/community/roadTestReviews/1846
As per some requests. I made some videos showing how to measure current using a voltage output current probe (either a current transformer or hall effect type AC/DC probe) that is NOT made for tektronix digital scopes. Most recent tek probes feature either Tekprobe or TekVPI data connections between the probe and scope that automatically configure and deskew the probe on the scope to measure current. If using older tektronix probes with separate amplifiers that you bought on eBay, 3rd party (ie higher power levels than tektronix supports or cheaper), or homemade, these two videos show how to setup a scope to measure and display current directly and to deskew voltage or current probes when using mixed probe types.
If there are any other things you would like to learn how to do on this scope, feel free to ask.