Just thinking about making the lives of the web developer easier...

Whats the best way of building a site so re-used static items are easily updateable... ?

For example:

Navigation..
Fave sites drop down..
footers...
etc...

I've used..

PHP Includes
SSI
Dreamweaver Templates (although this can't cope with changeable head content)
Frames
iFrames

So, what does everyone else use???