Idea: Long polling mining proxy

[Hawkix]

Some pools (hey, Slush, do you listen?) still do not implement LONG POLLING. My idea is that what if user installs a small mining proxy which will connect also to bitcoind (or some web service) and will provide client side LONG POLL notification on the other side. Rest of the traffic will pass directly to the pool.

Is it feasible idea?
Isn't it already implemented somewhere?

[error]

Multipool already does this.