I've been looking into creating mobile content. The .mobi website seems to suggest that you should create them using XHTML Mobile Profile (cut down XHTML). This uses MIME types application/vnd.wap.xhtml+xml or application/xhtml+xml. Such as m.facebook.com

But alot of sites are still using WAP WML which is MIME type text/vnd.wap.wml. Such as mobile.bbc.co.uk

Whats the best one to use? Any suggestions?