Hi mate,
A year ago I posted on here looking for a similiar sort of thing. It's not going to be as easy as you think. I develop the UK database for a product called CoPilot (a flight planning program) which works with another product called FlightMaster (a moving map GPS program), these are both Palm based. I learnt quite a bit the hard way, anyways here are the sources I use.
For worldwide data I use the following file:
https://164.214.2.62/dafif/dafifpfps...we_amc_ed7.ZIP
It's called the DAFIF -by the American military basically. It is very comprehensive. Every NDB, VOR and fix is contained within it with frequencies etc. However one major limitation - it only contains airfields that can accomodate an F16 - although the data that is provided is very detailed. Eg runway headings, runway lengths, surface, ILS etc etc.
However due to the above limitation a lot of UK GA airfields are not listed.
The above zip file contains individual text files, for example ARPT.txt for airports, NAV.txt for VORs and NDBs, all are TAB delimited therefore they can be imported into any database and then tidied up.
If you want every airfield in the US and Canada (I think), you can subscribe to the FAA's own data. I can't find the link right now. This costs somewhere in the region of $19.99.
If you want data on European airfields you could sign up to the free basic service from EADS:
http://www.ead.eurocontrol.int/publi...c/pu/login.jsp but bewarned - it's pants! - it'll get you basic lat/long and runway orientation/headings but nothing else. However, once again not all airfields are listed in there.
And for that, well what can I say.......you got to collect the data youself, which is what Jeppesen do and then charge you for!