I read the book Happiest Toddler on the Block by Dr. Harvey Karp... it really makes a lot of sense and had some GREAT tips. If you aren't a reader, he also has a video (Happiest Toddler on the Block)... you can get it from the library in Columbus maybe the Akron libraries would have it too.
First, I would try to analyze why your toddler is having temper tantrums. Lots of times our toddler has tantrums when she's hungry or tired... or uncomfortable. Try to diminish tantrums by avoiding or taking care of the reasons behind the tantrums.
One of the things Dr. Karp talks about is "Filling the tank." That means spending little bits of time throughout the day doing meaningful things with your toddler... read his book for some good ideas. (One of them is the "gossiping" technique. When he/she does something really great, gossip about it to dad/grandma/even a toy.) I've started using some of his quick techniques and have found an improvement... the techniques he uses don't take but a few minutes here and there.
There are many, many other techniques in his book. If he/she is having them alot it could be attention seeking behavior... have you tried making sure your toddler is safe and then just ignoring it (walking into another room)? If they don't have an audience, temper tantrums aren't nearly as much fun.
We have found that when our daughter is in the "heat of the moment" time-outs don't work. We did have some success though with putting her in the pack 'n play (which we have up for our baby) for a time-out.
Good luck! Toddlers can be SO emotional... but LUCKILY it's a phase that they will soon outgrow. :)