Lantronix Spider is a small, portable, affordable and web enabled IP KVM.
Supports ISO mounting and has USB connections.
http://www.lantronix.com/it-management/kvm-over-ip/securelinx-spider.html
It is a single server unit. So if you want to connect many servers at the
same time, it might not be the best option as the price quickly escalates.
However, if you buy one and just move it from server to server (which is
what I got from your email), then it is a pretty good fit. Java based web
interface, not the greatest, but it works.
I've got a few Lantronix Spiders and I love them; however, I would opt
to get the external power adapter instead of just relying on the unit
drawing power from the computer it's connected to.
Also, there is a PS2 + USB model available that I'd recommend getting if
you have any older gear which doesn't support USB keyboards while in the
BIOS.
I think they go for around $260 + another $20 or so for the external
power adapter.
Jeff