trafficshaping for ISPs

Hi,

I'm admin for a small ISP (DSL and dialup), using RH Linux 9 on our
servers.
I'm currently shaping all traffic by marking packets according to TOS
and classifying with HTB and SFQ.
I thus have 6 classes, one for each TOS and have a SFQ qdisc on each of
those. (this on the interface going to the internet)
So far so good. Everything is working (after much grief I might add).

However, I'd like to be able to do other things like managing the
bandwidth. Limiting on certain connections and sharing with different
contention rates. For ex. I'd like to give some DSL lines dedicated
bandwidth and some shared bandwidth and some with
even-more-shared-bandwidth, etc etc. and I can't see how I can do that
in conjunction with the TOS classifying that I'm doing at the moment.

So I'm interrested in seing how other ISPs do their shaping. If not as
scripts then at least in diagram form. I find that most stuff on the
net explaining this is geared towards the home user which is next to
useless for me. If anybody who works for an ISP would like to post some
diagrams that would be great, otherwise some links to sites dealing
with this would also be great.

Thanks.
Regards,
Tobias Skytte