I understand that Mercury isn't configured for multi-site Drupal installs as of yet. I have heard this is because of issues with Apache-solr and memcache.
Question: Will these issues be resolved in the future, and if so, any predictions as to when Mercury will be compatible with multi-site and Aegir??
Question: What about multiple virtual hosts on a server? Can Mercury handle that? In other words, can a VPS host more than one Drupal virtual host (with separate Drupal codebases) and still use the power of Mercury?
I have several websites that need to run on a single VPS. It would be great if Mercury could serve optimized hosting to more than one site at a time.
PS: I'm a newbie to Mercury, so I hope these questions make sense. :-)

Comments
Main Aegir + Mercury Wiki Page...
I've gotten help by reading up the resources on the following page...
http://groups.drupal.org/node/55033
I've gotten memcache to work with multi-site (http://groups.drupal.org/node/35984#comment-203858) , but not solr. to me, it's not that big a deal since most my client sites are smaller brochure sites.
solr with multisite
http://groups.drupal.org/node/72488
what you don't know will inspire you
Solr integration with Aegir
Solr integration with Aegir via searchlight module
http://developmentseed.org/blog/2010/may/27/searchlight-views-driven-app...