In Robert X. Cringely's 14 March 2002 column, he mentions the programs that are available that will wipe your browser's history file and cache so that other's can't see what you've been surfing. He goes on:
The only problem with those programs is they leave a squeaky clean system that makes you look to the boss like you are hiding something, whether you are or not. So rather than delete files and caches, my idea would be to REPLACE them. You could start www.cleancache.com and have there sample history files and caches ready for downloading. Just choose a profile — little kid, history professor, java programmer, soccer mom — and actual content from actual people would be downloaded, replacing your surfing identity with theirs.