Web site compares 21 web conferencing solutions in a vendor-independent review
there is a very helpful and informative web site called http://www.webconferencing-test.com/ that compares 21 web conferencing / online meeting solutions in a transparent vendor-independent test. Web conferencing software has been rated in these reviews based on number and scope of features, user-friendliness, speed of online meeting setup, ease of software installation, cost, security, and overall system requirements. It certainly will help you select the most efficient tool.
If you're looking for a simple one-on-one web meeting solution, I would recommend Dim Dim. Functionality is great and the best part is there is a free version. If you are looking for more sophisticated functionality and hosting larger web meetings, I would also take a look at GoToMeeting.