BBC web site has details of a new dating method for pottery based on the rate that it takes up water since firing.

If this works as stated here then it offers significant dating opportunities for sites where other dating approaches aren’t possible.

news.bbc.co.uk/1/hi/scotland/edinburgh_and_east/8058185.stm

Royal Society Link at royalsociety.org/news.asp?id=8527

Paper by authors from 2008 outlining the processes involved
mace.manchester.ac.uk/aboutus/staff/academic/profile/publications/journal_pdfdownload.php?id=1766