It would appear based on current BGP peering information that Bresnan no longer uses 360 Networks at all as far as peering goes. This confirms many of the traceroutes I have seen and done myself but just didn't notice 360 is no longer part of the equation.
These are Bresnan's current peers as seen by Hurricane Electric's tables:
Rank Description
1 AT&T WorldNet Services
2 Level 3 Communications, LLC
3 Cablevision Systems Corp.
4 Qwest Communications Company, LLC
5 RCN NEW YORK COMMUNICATIONS, LLC
6 ITECH CORPORATION
7 Wyoming Medical Center, Inc.
8 Salish Kootenai College
9 Wyoming Supreme Court
10 The Computer Shoppe, Inc.
11 University of Wyoming
12 RightNow Technologies, Inc.
13 Wispwest
14 Missoula County Public Schools
15 SIERRA TRADING POST, Inc.
16 Little Apple Technologies
17 MERLIN INFORMATION SERVICES
18 Green House Data, Inc.
19 State of Wyoming Department A&I
20 First Interstate Bank