This is just great - the new functionality makes it easy to create Dynamic Listpages that need just a single ListPages module to show different lists depending on what the user chooses from a dropdown selection. Using the example of bands that we have in the documentation you can display a list of rock bands or folk bands or country bands etc all with just one ListPages module.
The key point is that you don't need to hard-code the selection parameter but can use %%form_raw{field}%% to select it on-the-fly.
A working example of this is at http://vineyard.wikidot.com/bands:main which is unrestricted so you can try this out and see the code both there and on the bands:_template page.
When creating a band in the band category there is a select field called type for the type of music. I have also put that same field into the bands:_template page so we can use a dropdown list to select the type of band. The bands:_template page also holds the ListPages module:
[[module ListPages category="band" _type="%%form_raw{type}%%" perPage="50" order="name" separate="false" prependLine="||~ Band||~ Type ||" appendLine="||||||~ ||"]]
|| %%title_linked%% || %%form_data{type}%% ||
[[/module]]
I have then just put an edit button on the bands:main page which opens the dataform, you select the type of band you want, save the page and the new list is displayed.
I'll add something to the documentation about this when I get a chance.
(Edit: an example of this in action on a live site is at http://marblesprings.wikidot.com/humans-connect:page)