Yeah, they've all got limits that pretty much stop any free api from being usable in a general app:

Free: max 500 requests per day, 10 per minute.

NOAA is interesting; they _do_ attempt to provide their data for free, but seem to have capacity issues. Ultimately, they suggest no more than 720 queries per hour in their documentation, and warn that their API will have issues with high-volume use... Still, might be an option.

These guys are better than most; 3000 requests per minute, and a total of 4 million per day, before you have to pay for a higher level of service. Might even be usable for the number of Maemo users remaining...

Their free API maxes out at 4000 requests / day. Paid for more.

Which actually brings me to a question: are there any options left for commercial, paid apps on Maemo? None of these weather providers offer direct-to-user payment plans; their APIs all assume they will be getting paid by the app (or web) developer, and that person will be finding some way to generate revenue.

Actually, I've been mulling this over for another app I've been working on, so let me open a new thread for it.