I am in need of real time web conferencing medium which could be applicable for both Mac and PC. Most of my colleagues use Mac and my relatives use PC. Is there any solution available that can serve my needs so that I have not to expend for two appliances. All tips and suggestions welcome.

I think you should opt for GoMeetNow which is available from http://www.gomeetnow.com/. It is a multi-functional web conferencing for both PC & Mac. Its "Universal Attendance" technology ensures that everyone can join the meeting with no download whatsoever, supporting attendees on Windows, Mac, Linux, Unix, or iPhone. A class product and you can also use it for remote PC access. Even Don Cameron, President and CEO, ConferTel quoted it as Slick and Simple. When I first used it I got a free trial. But not after using it for a year now I am confident to recommend it to you. Try it , it won’t disappoint you.