> Look for some good books on OO theory and design.
>

Thanks Jerry, maybe the php 5 approach is a better implementation than
the php 4 approach? I have always felt that in php 4 using classes (or
at least my way of using them) was more a convenient way to organise
code, grouping some related functions in one class, other related ones
in another...

Gotta get me some books & hope it's going to be a loooong coooold
winter ;)