Glad to hear you're enjoying SearchTogether!
Part of the idea behind SearchTogether is to enable search over a variety of sources, since the use of diverse sources by different group members is a common collaborative research strategy. This was part of the inspiration for the "multi-engine search" feature, although this feature is not fully fleshed-out in the current Beta.
The idea behind the "multi-engine search" feature is that one group member enters query terms, and can assign different sources to different group members; each group member would then receive the search results for that query from his/her assigned source. For example, if Andrea, Beth, and Chris were investigating treatments for asthma, they might perform a multi-engine search where Andrea received results from Pub Med medical search, Beth received results from a general-purpose Web search engine such as Live Search, and Chris received results from a reference such as Wikipedia. This would provide the group with a variety of perspectives on their target topic.
However, you have probably noticed that the current version of SearchTogether offers only general-purpose search engines (Live, Yahoo!, and Google) as source options for multi-engine search. Since the current release is a Beta, we didn't get a chance yet to integrate special-purpose search sources. The vision for SearchTogether is to have an extensible API such that users can add their own preferred search sources for a variety of specialized topics (travel, medicine, academic research, corporate intranets, etc.). Unfortunately, this is not yet implemented in the Beta release.
Thanks for the question!
- Merrie