Submit an automated test that fails along with your bug report
We touched on this one before with this tip from Dave Christiansen, however the topic came up again at last month's IWST. Depending on the tools you use, you might consider attaching automated scripts to your defects. If you can find a bug, and then quickly record a simple script that recreates it, attach that and send it along with the defect report.
This tip was part of a brainstorm developed at the September 2011 Indianapolis Workshop on Software Testing on the topic of "Documenting for Testing." The attendees of that workshop (and participants in the brainstorm) included: Charlie Audritsh, Scott Barber, Rick Grey, Michael Kelly, Natalie Mego, Charles Penn, Margie Weaver, and Tina Zaza.