eBay, Typepad and Sega were among the companies to jump on the iPhone bandwagon at Apple's Worldwide Developers' Conference (WWDC) today, with executives from each firm joining Steve Jobs on stage to show off new tools built using the iPhone’s Software Developers Kit (SDK).

Ethan Einhorn from Sega demonstrated Super Monkey Ball on the iPhone; Sam Altman from Loopt showed off what appeared to be a location-based social networking tool; Michael Sippey from TypePad demoed a native iPhone blogging client; while Ken Sun from eBay revealed new functionality for enabling users to access online auctions from Apple's handset.

The eBay/iPhone app has been designed over the past five weeks, with Sun claiming Apple's smartphone is the mobile device for accessing the online auction service.

Other companies making use of the iPhone SDK include the Associated Press with its Mobile News Network, and Mac game developer Pangea Software with its a physics-based puzzle game Enigmo.

All of the tools will be available on the Apple's iPhone App Store at launch.

Jobs said that in the 95 days since the SDK was announced, over 250,000 people have downloaded it, while more than 25,000 people have applied to the paid developer programme.

Jobs told his keynote audience that a record 5,200 attendees are at this year's WWDC. "Wish we could have had more, but we sold out," he said.

The event is scheduled to feature 147 sessions; 85 on the Mac and 62 on the iPhone. "It's gonna be packed," added Jobs. There will also be 169 hands-on labs, and over 1,000 engineers are said to be onsite.

Jobs also confirmed that developers would get their first look at OS X Snow Leopard later today.

Check the PC Advisor for the latest news from WWDC.

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