Felix Geisendorfer has a "quick hit" tip posted to his blog today on using HTML 4.0.1 in your CakePHP 1.2 installation.

This is just a little tip for those of you who dislike their xhtml to end up as tag soup and still prefer to send out Html 4.01 strict. Here is how to make all helper functions in Cake 1.2 output Html 4.01 compliant markup instead of xhtml.

The helper he's created just loops through the entire $tags array and does a replace on the greater-than sign to add a slash to make it compliant.