So far I've been the lucky one, and lost hardly anything from my inventory, and the one expensive thing that couldn't be rezzed, can be rezzed now (pfew) BUT:
I lost my ZHAO HUD, when I put an other HUD on the ZHAO position, it went gone. Not only did it not return to my inventory, the animations inside has disappeared too. Now I had all my notecards and (no-copy) animations in one folder as back-up, but I discovered half of the anims in the folder have disappeared with the ZHAO. (Damaga: approx L$400 loss, bought them few months back so the creator will most likely not be able to retrace the purchase, though some anims I can't even retrace myself!)
I remember having two radar HUDs too, which I checked out too and one of them is missing too, though I might've deleted it myself (freebies) so I'll stick to the ZHAO-problem.
Maybe someone else has experienced loss when a HUD got (re)moved/replaced.
To Linden Labs: please works on your servers, if it isn't those eternal bugs messing up *something* it's the servers, especially the asset server problems limit the use of SL. (I am talking textures and scripts that won't open and objects that won't rezz).