have you guys seen this? i hope it's ok to post here... i dunno, maybe it would even make a good sticky thread? i found this THC Calculator program at www.drugs-plaza.com/downloads.htm here's the direct link to the download and it's only 49kb: http://www.drugs-plaza.com/downloads/calc_thc.exe at first i thought it was going to be misleading, but after playing around with it a bit, it seems to be in the right ballpark for accuracy, except that it seems to take some people even longer than the maximum time indicated to get clean. it illustrates nicely how smoking daily or just a few times a week can really affect things, and it can account pretty well for when someone smokes and abstains and smokes again at odd intervals. of course it can't take the place of a real at-home thc test, but at least it can help give all those who are wondering where they stand a pretty good idea to begin with. hope it helps.