I took this shot on the summer of 2004 when I had the old "obsolete" Sigma 70-300mm macro. This is cropped and viewed by 100% actual pixel size. If I am able to get this close when cropped, imagine how close I can get with the Canon 100mm macro!
Despite how ugly I think this creature is, it was a very cooperative model. It stood still the whole time!
2005 update: I got a similar sized spider with the new Canon lens. But this time, I got a nursing one! http://www.pbase.com/htsung/mother_wolf_spider