soaringadi.... this topic is covered a lot. "Expand" is defiently the wrong word to use, the issues are more accurately: retrofit/adjust/repave/remodel/install/etc.
I imagine most airports won't expand to serve the 380 but actually reduce gates to serve it (make two planestands into one big one, make two passing taxiways into just one due to wingtip clearance issues, etc.)
And until you see a pic of an A380 stopline (a pic of a doubledecker jetway wrosk too) don't believe folks who says their airport is 380 ready... some folks on this forum seem to think a380 ready means you have wide-body gates, a long runway and a DFS shop. The issues are much more complex including taxiway centerline seperation, taxiway turn angles, shoulder width, planestand configuration, pavement issues(?), etc.
(Sorry if I sound fiesty... I just get annoyed by people claiming there airport is a380 when it's not.)
EDIT: To replier #1's credit... it appears that MUC is the only airport in Europe that is a380 ready as of April 8, 2004. (no USA airport are) The other airports are apparently Bangkok, Dubai, Gidda, Hong Kong, Kuala Lumpur, Narita and Singapore. see link http://www.munich-airport.de/EN/Areas/Company/Medien/textarchiv/textarchiv04/PM_16/
[Edited 2004-05-11 09:23:40]