motivating google search users for more info

[shlomisa]

hi.
i have a vb forum that most of the traffic in it comes from Google users.
the problem is that the bounce rate of this users is a bit high.
sometime they just get the info they looked for and run away, some time they stay.
I would like to encourage those users to see more stuff at my site and maybe give them some answers from another sections in my site.

i thought about an add on that display those users there Google search phrase in a place that they cant ignore it and next to it display some info that will be related to there search.

ill try to give example:
if a user searched Google for a "recommended tennis racket for armatures" and came across a thread in my forum, if this users eventually comes to my site i want to display, next to the thread info, a message that sayes "want to get more info on recommended tennis racket for armatures ? "
go to our store and find user reviews
go to our catalog and find ...
ask our on line ...
and so on.

is there ant addon that do this ?
if not, can someone please advise how can i get , inside a template , the site that referred the user to my site ?

thanks,