i use an PNY 2GB.
Had it since last Fall IIRC. Its still working, i use it about 2 times a week now using Firefox Portable on my schools computer, since their IE doenst have tabs or they dont have Firefox.
Just dont pull out the Flashdrive when its accessing it, the results would most likely be data loss and/or malfunction. Right click on the safely remove hardware thing will be the best thing to do if possible.