I was wanting to know if Android had a similar feature to the iPhone in that you can use an HTML A tag to send an SMS by setting the HREF
attribute to the phone
I found the following which may help you:
http://tools.ietf.org/html/rfc5724
You can check sub-section 2.5 or 2.6 of this RFC to give you some additional pointers on formulating a proper SMS URL.
For example:
...
SMS Me
...
Notice the 'escaped' character for the 'space' in the example above.
Hopefully the Android browser will permit you to generate XHTML forms based on this syntax. I believe they will (if I have some time over the next day, I shall give it a try on my Galaxy S).