How about something as simple as a Widget for gTalk? Ya know, something that would display your unread messages, unread messages count and maybe quick respond? This seems like a no brainer for me and I am SHOCKED that there is nothing on the market. There are countless apps like this for SMS, but none for gTalk which I believe is fairly popular in itself.
Would definitely pay for something like this because gTalk is, by far and away, my main form of text communication.