How to have a combined search view that shows both users and content on search terms? I've looked at multiple modules (Faceted Search, Custom Search, an abandoned project named search_all) but I haven't been able to find anything that works with 7.x.

What I'm looking for is just a way to let users search on a search term and then get a page of results from all content, including other users in the system. 

Any ideas?
Haven't tried it, but I believe you could use Apache Solr with the http://drupal.org/project/search_api, http://drupal.org/project/search_api_solr, and http://drupal.org/project/search_api_multi

Create two indexes, one for nodes and one for users.  Then create a view that uses both indexes.