TOMS is basically part of Toyota's factory motorsport division - I know they run the Japanese F3 team (go James Courtney!) and run Supras in the JGTC - and I think they ran the Le Mans sportscars before TTE (Toyota Team Europe) came into being a few years ago. Don't quote me on any of this. I couldn't find any websites.
a quick search on yahoo yielded the official TOM's website...its a performance tuning division of Toyota just as VAT-MAN suggested...this site is however written in Japanese with no english translation as far as i can see...there are some cool pics on there however...