I gave a talk at last night's Philly CFUG meeting on making the migration from Verity to Solr in ColdFusion 9. Adobe has made it known that CF9 is the last release of ColdFusion to contain Verity and that Solr is the way forward.
I'm glad that's the case! Solr is amazingly powerful, fast and extensible. What has been exposed in CF9 barely scratches the surface of what it can do. That's not a bad thing - the Adobe team should be commended for making the transition as simple as possible by using the same tags, attributes and data structures. You'll find (as I did) that the migration is relatively straightforward provided your codebase isn't a real mess. 90% of the effort will go in to adjusting any code that builds formatted search criteria in Verity-specific terms into something that's Solr-compatible. Collection maintenance is left essentially untouched.
If you'd like, you can grab the slide deck and simple examples - with one disclaimer: the code is for example purposes only and should not be held up as an example of ideal coding practices :-). Special thanks to Ray Camden and Scott Stroz for their blog posts on Solr - their work was great background for this talk. Also - thanks to Adam Tuttle and the Philly CFUG for inviting me to speak!