Yes, but you'll need the Dual-DVI converter cable unless the monitor has a mini-Display Port connection.
Can the alum. macbook drive a 30" LCD (2560x1600)?
The maximum resolution that your MacBook has for an external monitor is 1920 x 1200.
I think you are wrong.
Hum, http://www.apple.com/macbook/specs.html
does not seem to list the info. Someone might want to post the link with the info.
MacBook said:Extended desktop and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 2560 by 1600 pixels on an external display, both at millions of colors
You should be aware that there have been issues reported with that converter (not an adapter - it is an active converter). There have been many reports that one of the links suddenly dies, or that the display becomes garbled. I would recommend that you check it out first.