O'Reilly Media is holding a conference where smartphone app developers and experts will share their knownlege of buuilding applicaitons accross multiple platforms. The event, called InsideMobile, will take place from July 26-27 at the eBay Conference Center in San Jose.

According to O'Reilly, InsideMobile will be one of the first conferences to teach programmers the basics of developing on all major mobile platforms, including iPhone, Blackberry, Palm webOS, Windows Mobile, Symbian, and Android. And, although although the Palm Pre webOS SDK has yet to be publicly released, InsideMobile has been granted special permission by Palm to host not one, but two, 4-hour training sessions on developing for the platform. 

See here for an early lineup of sessions for the upcoming two-day event, which costs $400 to attend. The first 100 registrants can get in for $250.