A painless transition to more advanced technology : The web is moving to XML, a powerfully enabling technology. Writing well–formed, valid XHTML pages is the easiest way to begin this transition.
Cleaner, more logical mark-up : XHTML brings uniformity to document structure. The rules of XHTML help restore the structural integrity of documents that was lost during the web’s rapid commercial expansion between 1994 and 2001. This is critical for large organizations to maintain legacy systems and provide future accessibility.
Increased interoperability : Valid, well–formed XHTML documents can easily be "transported" to wireless devices, Braille readers and other specialized web environments. Moreover, XHTML’s insistence on clean, rule–based mark-up helps us avoid the kind of errors that can make web pages fail even in traditional browsers like Microsoft Internet Explorer.
Greater accessibility : Because they follow strict rules and avoid non–standard mark-up, well–authored XHTML pages are more accessible than old–school HTML pages, helping the site comply with U.S. & International laws regarding accessibility guidelines.
A painless transition to more advanced technology : Your site will be using the latest mark-up, providing a range of tangible benefits.
Cleaner, more logical mark-up : Allowing your site to render and load faster. Providing also a structure that can be maintained no matter how much you scale up or down over the course of your sites lifetime.
Increased interoperability : Your site will work in all current and most old browsers, effectively making sure that no matter who is viewing your site or from what piece of hardware they are using, they will enjoy the same experience and see the same things. This could even allow your site to render on mobile devices and many other portable hardware and specialised devices.
Greater accessibility : If you don't build your sites to allow for the disabled or even hardware that has been deliberately crippled for security reasons and your site does not work correctly and in as much rich detail as a normal user would enjoy, you are opening yourself up to unnecessary legal risk. XHTML is a step in the right direction for accessible documents.
A Plus Design - re-designed, be back with you shortly