I'm in the same boat as the mom whose child gets into things while she's indisposed. The way our kitchen cabinets are, I pretty much have to have (some) breakables down low. Not a cabinet I want my little one into. Glass plate + Tile floor = Nice big mess!! Honestly, it isn't as much of an issue now that he's a bit older. But for some months, we *needed* something on at least a few cabinet doors in order to keep him safe.
I'll echo the magnetic locks recommendation. We used Tot Loks found at Lowe's, Home Depot (probably WalMart and Target too).
I'll also say that we had a Kids' Cabinet. Just one cabinet or drawer that they call their own. It has regular kitchen stuff in it: small (sturdy) skillet, a couple spatulas, large spoons, plastic cups, plastic bowls, etc. It let both my kids at that age feel more a part of things in the kitchen if they were able to go get something on their own.
HTH and hope it makes sense! Feel free to email with any questions!
K., mama to
Catherine, 5y
Samuel, 2y
EDD Sept '09