i wouldnt be in too much of a rush, font tags, etc have been deprecated for like ages, but id say at least 80% of all current sites use them, but even still making web sites xhtml compliant isnt a big task, apparently there are 'engines' that can convert html into xhtml strict code just like that, a simple search and replace should do the job (on smaller to medium sized sites)
ive been coding in xhtml for a wee while now, and its beginning to become habit. one thing ive done all along is use lowercase for tags, etc all along, mainly for the 'look' of the code, but i wouldnt call my pages xhtml strict compliant, cos they are still a little rough around the edges :D
grtz sal.
nz