If you're new to OO or want to solidify what you already know (or *think* you already know ...), you're going to want to check out Hal Helms' latest series of newsletters:http://halhelms.com/index.cfm?fuseaction=newsletters.detail
Hal has a real gift to explaining OO concepts in a way that makes them very easy to understand and is very passionate about getting people to start thinking in OO, so his latest two newsletters (and the upcoming ones he's hinted at) should be considered "must read" materials for CFers looking to make the transition to OO. And that should be each and every one of you!
I'm going to be covering an intro to OO thinking, principles, etc. at our February CFUG meeting as well so I should have some thoughts over the next month or so. This will be a good way for me to get started on the series of OO blog entries/articles I have planned for the new year.
I hereby declare 2005 to be "the year of OO" for all CFers! :-)