It’s a big week for tech startups as they compete for attention at the TechCrunch Disrupt and Fall Demo conferences in San Francisco and Silicon Valley.

A “Startup Battlefield” has just begun at Disrupt with new companies given six minutes to pitch their services and applications. A look at the contenders from the first session, focussed on disrupting traditional markets, is after the jump. Read more

Gowalla, the location-based service that competes with Foursquare and others, has announced a major shift in direction – adding city guides to its product and moving on from its founding concept of check-ins.

Josh Williams, Gowalla co-founder and chief executive, unveiled the revamped service at the TechCrunch Disrupt conference in San Francisco on Monday. Read more