I personally struggled for a long time to grasp OOP, and then OOP in Perl. About two years. I don't have any formal training in computer science, but knew it was an important concept to try to learn. I read all the perldocs. I read the Conway book. But I just needed something with short clear examples that did not contain the distracting "humor" that seems to be part of the culture around Perl.

In the end I finally found The One that did it for me: Tutorial: Introduction to Object-Oriented Programming. Its in the Tutorial section here, which was mentioned by the first poster - but there are 21 others. This one is wonderfully clear and the examples are very clean and straight forward. The ensuing conversation elucidates the pitfalls in the presented material beautifully and concisely. As a bonus, a lengthy portion of the conversation also covers inside-out objects in Perl.

Using what was written there I wrote my first completely OOP database driven web application... and I loved the result. There was a lot more code to write, but the maintainability trade-off was very worthwhile. My complements to jreades!