Call me old-fashioned but I do prefer text-only email, and it should be viewed in a nice mono-space font like courier or monaco so indenting and formatting with spaces can be easily done. Here is a nice rant on HTML email from someone who has developed a web based email client.

I saw this recently and it made me smile:

 ()  ASCII Ribbon Campaign
 /\   Against HTML Email

And look, there are several versions of the ribbon!

 /"\
 \ /    ASCII Ribbon Campaign
  X   against HTML email & vCards
 / \
                       _
ASCII ribbon campaign ( )
 - against HTML email  X
             & vCards / \

Hey don’t just take my word for it, ask Google.