I remember seeing a RSS feed reader for hal. With a few address changes it would work. You might need to add a little html or something to actually pull the text for the clipboard.
I think any simple address plug in would work if you just want Hal to open it. For that matter with the correct address you just type it to him. If you want him to read it to you, it might take more.
There is also a check box for Hal always being on top.