html 5 yet?

To whom it may concern,

What's the latest with html 5 in the sense of when should everyone  
with a web site with videos that they want to be seen on iPad or  
iPhone?  I don't want to go thru the hassle of changing from xhtml  
strict to html 5 unless I think it's necessary.  I trust your  
judgement. What do you say? Is it time to change yet? My site is  
http://muralsandfauxpainting.com.  Thank you.

God bless you,
Sandy Silva
President
Murals and Faux Painting, Inc.
Faux Painting Techniques
Faux Painting Store