should I use my cross domain hack for providing web service?

should I use my cross domain hack for providing web service?


Hello,
I provide a web service. I've hacked out a way using jquery and
dynamic script loading that enables people to embed the service
directly into their web pages. Basically my web service responds with
content type javascript and sends the html as a javascript variable.
An analogy of the web service is a guestbook and my users can now
plonk the guestbook directly into their web page.
However before releasing it for people to try out I want to find out
if I'm asking for trouble? Is this a common technique that is used?
Are there security issues that I haven't thought about. Would I get
detected by the likes of google as potentially being up to no good etc
etc.
thanks