Yeah, forgot to mention that... Allergies is a problem (My hand swelled up like a blown up rubber glove last time I was stung by a bee). Also, for starter species (and docile species, etc.) try "new world" tarantulas, they are MUCH calmer, and nicer than "old world" Tarantulas 95% of the time.
Black widows and funnelwebs (like HoB mentioned) are resposible for occasional deaths, and we had a lady die from a widow bite who lived about 2 km from my house... Needless to say, they are probably not going to become very popular pets anytime soon