Each week Ross Rubin contributes Switched On, a column about consumer technology.
This week's release of the HP TouchPad, the first device other than a handset to feature webOS, aptly demonstrates the promise and perils of HP's adopted operating system. The 4:3 tablet provides the large canvas that webOS seemed born to cover. However, like the Xoom and PlayBook before it, the TouchPad suffers from an impoverished app library among other holes. To help share development costs of webOS and expand the market for its developers, HP has warmed to the i
