You know what would be really cool, and an insanely handy tool for those troubleshooting maxspeed= tags?

Something that could take an .osm file, and create a .gpi to make the Garmin alert on maxspeed restrictions. (ie, if it's not telling you about speed limits periodically, there's no speed limit data for the area).

Practical application: Spot the surprise school zone behind the curve on that rural nowhere highway approaching a nothing town with a bored cop before you get out of the trees. 55mph to 20 with no warning on a curve or hillcrest is a surprisingly common situation on school days in rural Oregon and Washington.