Guys and gals, in the old days we had a very close tie between the code and the documentation. As the project has grown the two have drifted apart. I think this is mostly because the phpdoc team has done an amazing job keeping up with the code changes and writing awesome documentation. This has made us a bit lazy and complacent.
I would like to encourage everyone on this list to spend a little bit of time looking at the parts of the documentation that cover things you are familiar with. Or even just going through some of the doc bugs and helping out in general.
He even includes some basic tips to get you started down the road to better PHP documentation - check out the phpdoc tree from CVS and run the configure.php command to test any changes you might have made. That's it! So I guess the real question is how much can you help?
Marco points to the bugs list as a resource to get started from.