First of all, thank you for developing this plugin !
I've been looking for this quite some time now, but could not find a solution for my problem. I was looking for the same option, to post a tweet to my blog (nothing special there) that included an image. Twitter Tools is great for doing all sorts of stuff, but it can not post Tweets to my blog AND show an image at the same time.
However, as you have tried your plugin from an Iphone (and it works obviously :)) you might not have been able to test it on an Android device I assume ? So I decided to do that myself.. Unfortunately, the current Twitter clients (Twydroid, Tweetcaster, Plume) for Android do not support defining custom (image) services (like on the Iphone). So right now I'm stuck...(:(
Any ideas ?
Keep up the great work ! And....once again thank you for venturing where no Twitter client has gone before..;)