This month (August 2008) PHP4 has reached its end of life.
The start of the Olympic Games in Beijing also was the end of PHP4.
One day before, on August 7th, a final release has been made, but now there will be no more updates for PHP4, except maybe through Linux-distributors that still support it.
Since now the focus really will swap over to PHP5 (and download-numbers of my classes already have shown such a shift over the last months) I will not continue working on the PHP4-versions of my classes anymore.
Just like with PHP4 there will be one final update, with the last changes I made. Afterwards I will not continue to update the PHP4-versions anymore.
They might even be removed from Subversion, as no more work is done on them from the day I will release the final version (which will be quite soon).