There are a few of us here , but not a lot. IIMARS is working well in E. Idaho and is under test in additional Eastern Counties. Several new transmitter sites have come on line recently and more are undergoing testing. It is not a very fast process, and although it is a statewide system, each county is implementing its part at their own pace, depending on grant money etc.
The RR database contains just about all of the info that is available right now. I can't comment too much on the Boise area, except that encryption is apparently being used on some TG's in that area.
Take a look at the database.
Scanner Frequencies: Idaho Interoperable Mutual Aid Radio System (IIMARS) Trunking System, Statewide, Idaho
The new five eastern county addition to IIMARS is undergoing testing and is operating intermittently. What is available on this new addition is covered in the database here.
Scanner Frequencies: Eastern Idaho Interoperable Mutual Aid Radio System (EIIMARS) Trunking System, Multiple Locations, Idaho
If you haven't looked at this thread, it is still has some relevant info.
http://www.radioreference.com/forums/idaho-radio-discussion-forum/122120-east-idaho-700-mhz-trs.html
Dave