Nikon released a dizzying lode of cameras at the end of the summer-eight new Coolpix models, as well as two new high-powered digital SLRs, the D3 ($5000) and D300 ($1800). If you want to learn more about the technology behind these new offerings, Nikon has posted a pair of podcasts at its Web site in which host Mark Ellwood and photography expert Steve Heiner discuss the new introductions and then dig deep into the workings of Nikon's latest high-priced DSLRs.