Most likely, that is it, since most CPUs aren't very efficient. As you saw, poclbm without any arguments gives you the list, for example:

No device specified or device not found, use -d to specify one of the following

•     AMD E-350 Processor
[1]     Juniper

If you don't specify anything, it will use the first device, which is usually the processor and very slow, so in the poclbm-commandline you would use -d 1 (instead of -d 0, the default)

Verbose is --verbose, with the latest windows version this is enabled by default, so you don't need that. You can see all the options by running poclbm with -h

There is more information about what other settings would be useful at

https://en.bitcoin.it/wiki/Mining_hardware_comparison

So, in the end, your commandline would be something like
C:\bitcoin\poclbm_py2exe_20110709\poclbm.exe -v -w128 --device=1 http://name:password@minerURL:portnumber

Of course, if you want to use all of them, you can run another copy of poclbm to use the 2nd 6870 as well, with --device=2 (or as many as showed up in the list of poclbm, except the processor which won't help much really, unless you want to as well of course)