I found a spider in my room the other day.  It was between my desk and the wall, perched on an electrical outlet.  My first instinct was to send it to spider heaven (or spider hell depending on its' character), but Rochelle convinced me to fetch a Best Foods mayonaisse jar so we could capture it.  After I captured the spider, Rochelle examined it, and identified it as a black (or brown, were not quite sure) widow, as denoted by the red hourglass marking on it's underside.  I had no idea this type of spider resided on the Big Island, but now I'm guessing it's probably quite popular (or notorious for that matter) over here.  Rochelle's mother will be taking Marilyn (the name given to the spider by Rochelle) to the entomology lab at UH Hilo for further examination.  I'm told it's a good specimen.
-Kynan (02.22.2000)

What KidsHealth.org said: "If it's possible, have an adult catch and bring the spider to the doctor's office with you - this is important because it can sometimes be hard to diagnose a spider bite correctly."

What DBirchall said: "Feda caught a highly poisonous spider?  Nifty."

Lots of pics and detailed info about widow spiders here.

This site is aimed at kids, maybe that's why i found it so useful.

Warning: this page sports a bright red background, did quite a number on my eyes.