Personally, I would like to have a scanner just to monitor all of the NIFOG and local interoperability and PSAP channels (conventional and trunked), the federal/state/local disaster response channels (conventional and trunked), the NIFC/NIRSC channels, the federal goverment common channels, federal and state wildland firefighting and conservation law enforcement channels, any other (especially seldom used) channels that I can think of, as well as Luke AFB's FD on their trunked system.
This would free up a main scanner to focus on city PD's and FD's, the Sheriff's Office, the county DOT's emergency response unit, a few other select county agencies (other than the EOC), as well as DPS, and ADOT enforcement and their emergency response unit.
MURS/FRS/GMRS may prove interesting, depending on who uses it in your area. A local GMRS repeater here has traffic reports, and a few members are Skywarn trained as well, from what I understand. (That's in addition to the Ham radio licensed Skywarn members on a 70cm repeater here, and an emergency net that also frequently becomes active on 2m when there's bad weather in the metro area.)
Once school is back in session, unless they have year round schools there, listening to your local school district buses can supposedly be great for traffic reports, according to posts here in the forums that I've seen in the past. A local school's security channel may also be interesting to listen to, if you're close enough to hear it.
Just some ideas.
John
Peoria, AZ