Safari 4 (beta) has the option to zoom the whole page, or text only.
The other option is screen zoom. Hold down the "ctrl" key, while scrolling with either the trackpad (two-finger) or a mouse scroll wheel. I use this more often than text zoom. It's great for an instant video zoom, too.
(I noticed you have the 17" UB too. The hi-res sometimes is a bit small, but I love the real estate.)