Like Chris, I've deployed Blacklight on Heroku, and this thread (particularly Rosalyn's message) has gotten me to write up a quick HOWTO on the Blacklight wiki [0]. For Solr hosting I've used both a VM that I run (on Slicehost) and EC2. Mark [0] https://github.com/projectblacklight/blacklight/wiki/Blacklight-on-Heroku