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I want put a Linksys WAP11 in my car so I can d/l songs without removing the unit. I am having a hard time finding a 5V 2.5A car adapter for the WAP11. Any ideas?

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A high-current version of a 7805 regulator should do it (or adding a shunt transistor to handle part of the current to a standard 7805. Circuit is i the appl. notes of the 7805, IIRC).
Thatl'l waste a lot though - roughly 20W in heat, so you'd need a fairsized lump of metal to cool it... A switching power supply would be much more efficient, but I have no design handy... lot more complex to build tho...

Another brute force approach would be a 12VDC->110/220VAC switcher and then plug the stock power 110/220VAC->5VDC adapter into that... Also somewhat wasteful, but probably less so than than a 7805...
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/Michael