another possibility in my quest for convenient ways to send text messages from my computer

I think I am pretty hooked on google voice for computer texting. I am nonetheless pleased to see that other options have improved. Google talk in gmail has had sms capability for a while, but since it incorporates all of the messiness of google contacts, I never liked it very much. The newer version works more simply; you have the option of entering the number you want to text without having dig through hundreds of gmail contacts.