Plugins and PHP 5

With the end of life of php 4 coming up i was thinking i’d love to take the leap and recode all my plugins to take advantage of the better PHP 5 classes.
However, I’d be interested to hear from other plugin writers to see if they will be doing the same.
I’d also be interested to here from WordPress users in general to see what version of PHP they are running on.

Thanks, -D