Traveling soon to Wisconsin, Warbler Guy....so where do I look up recent warbler sightings? Warbler sightings in Wisconsin are posted on ebird?

"Yes" to your question, Theo (in Chicago).

You would do well to see:

http://ebird.org/ebird/atlaswi/map?zh=true

Then type in the warbler species you'd like to pursue in Wisconsin.

This link shows the latest survey results from WI Breeding Bird Atlas volunteers documenting
nesting bird species throughout the state.

For example, I recently visited WI to pursue Connecticut Warbler.

The ONLY documented sighting I noticed in n. WI is linked from a 5/24/15 observation at:

http://ebird.org/ebird/atlaswi/map/conwar?neg=true&env.minX=-96.46825195312499&env.minY=41.84614104137589&env.maxX=-80.80174804687499&env.maxY=46.80861629908459&zh=true&gp=false&ev=Z&mr=1-12&bmo=1&emo=12&yr=EBIRD_ATL_WI_2015

Let me know if I can further help.

Regards, Daniel

(My "Bird Tours" information is at my web site via the "Bird Tours" tab:
warblerwatch.com)