Multiple Subnets / VLAN's on External NLB "load balanced" NIC's?

So I have TMG up and running with NLB enabled on a single VLAN.  However, we have a few external VLAN's/subnets that we need to use to publish web servers.  How does one accomplish this with TMG?  for example, let's say I have the following external ranges
140.10.10.x /24
140.10.11.x /24
140.10.12.x /24
My current setup is using 140.10.10.x  so I have a static address and all VIP's coming from this range, but now we need to publish a server from the 140.10.12.x range.

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The simplest answer is,...No, can't do that.
If the Web Servers are external to the ISA then they are already "self" published and the ISA/TMG is not even involved.

A more detailed answer requires a lot more work and a lot more information.

In what manner do these other external segments exist?  .....LAN Router on the external side with each branching off of it (like Hub & Spoke)?

If the Web Servers are internal to the ISA/TMG then you only publish each from one chosen IP# from one segment.  Users external to the ISA/TMG must have a routable path from where they are to the IP# the Web Server is published from.

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The only you could do this, is to assign IP from the range to TMGs and then publish it through the TMG externally load balanced adapter on the TMG.

Of course this means that you will have to sacrifice one NIC on the TMGs for connection to the 140.10.12.xx

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