Over lunch we were discussing how it would be handy to know whether a paycut would be covered by cost savings of a shorter commute. A mushup to do the calculation for you seemed pretty doable, and you could use the same thing to find out how much money you’d save working at home a couple of days a week. Oh yes, and the environment etc.!
Well, it seems that there are at least a couple of mashups already that do part of the job. Unfortunately both these examples are a bit US-centric and don’t take in to account PAYE (so now I’m being UK centric!) but they’re a good demonstration.
I also discovered that the OS now have an API! Looking through their FAQ, they (or more likely their lawyers) have some funny ideas about how the web works, but still, better than not supporting mashups at all.