E-Commerce

Short answer: it depends.

We still do most of our projects in Drupal 6, mainly because it's been around a few years, and modules we use on many sites are not yet stable for Drupal 7 (and some are still a ways off).

However, for sites that don't need particular modules, Drupal 7 at its core is a nice improvement.

My first Drupal 7 site is a personal one, http://www.hikeswithhazel.com. So far as a user, it doesn't seem that different from Drupal 6, especially if you turn off the "Overlay" module which pops open editing screens in what I find to be a highly annoying way.

Planning a vacation is tough. Between the pain of finding a hotel or final destination, booking an airline, and locating information on things to do, one could spend days online surfing from website to website searching for items that may or may not be correct and/or relevant.

Isn't a vacation supposed to relaxing? Shouldn't planning and booking a vacation be as relaxing? 

I think so.

We've built custom shopping carts, as well as implemented several different open source shopping carts, including Zen Cart, OS Commerce, VirtueMart with Joomla, and Ubercart in Drupal. We've also built SOAP servers to allow manufacturers to take orders from distributors. We've built payment gateways for several of these systems, and imported products and images from other content management systems and existing online stores.