The City of Boston Trunked system is in the process of converting to a Type 2 system. This list below was sent to me by Kenny M. who got it from a friend.
Many folks are trying to figure out all the new talkgroups. They will all be posted soon on Steven Johnson's site once they are all confirmed. There is also some new info on RadioReference.com

Boston T.R.S. Now using Motorola type 2 system

Frequencies
851.5375, 852.1875
856.7625, 856.9375
857.7625, 857.9375
858.7625, 858.9375
859.7625, 859.9375
860.7625, 860.9375


Talkgroup ID's;

Traffic & Parking
43248 - Operations
43280 - Parking
43312 - Traffic
43344 - Towing
43376 - Admin.
43216 - unit/unit   (I have heard this referred to as Ch1  JM)

D.P.W
44816 - Central
44848 - Highway
44880 - Snow
44912 - Sanitation
44944 - Street Lighting
44976 - Engineers
45008 - Construction
41040 - Announcements

Municipal Police
52816 - Dispatch
52848 - Tow Lot
52880 - Warrants
52912 - Admin.
53040 - Special Events
53072 - City Hall Security
53008 - Unknown
52976 - Unknown
41072 - Announcements

Citywide
41616 - Emergency
41648 - Events
55056 - Ems 1
55184 - Hospitals 1
41616 - Emergency
41680 - Ch.3
41712 - Ch.4
47376 - Preparedness

Parks
49744 - Rangers
49808 - Ranger unit/unit
49712 - Maintenance
49840 - Ch.14
49872 - Unknown
49904 - Unknown

Public Health Commission
9375 - PHC Police 1
47248 - PHC Police 2 (Long Island)
47280 - PHCPolice 3 Common
47440 - Ch.10
47472 - Community Health Centers

Penal (South Bay Correctional)
35072 - Emergency
35584 - Security
35840 - Admin.
36096 - Maintenance

Inspectional Services
41040 - Announcement
48016 - Animal Control
48048 - Building Inspection
48080 - Health Inspector
48112 - Electrical Inspector
48144 - Code Enforcement
48176 - Admin.
48080 - Special Ops.
56304 - Ch.4

B.P.D. (not dispatch ops.)
39168 - Emergency
39424 - Tac.1
39936 - Tac.3
41008 - Maintenance