Hmm, my stuff!

[Nerull]

If you have ToB installed, just hold down the Tab key. It will highlight stuff on the ground in blue. Helps in finding stuff that drops (there's a couple of places like that), and also good when looting in a cluttered area (lots of stuff dropped among lots of corpses).

If no ToB, you are stuck with your observation skills and/or moving the cursor around slowly until the stuff highlights.

Any time someone leaves your party, make sure to look around the area they were standing. Very important thing to remember to do (my first game through I was victimized the same way, mostly because I had not come to this forum yet).