It can be a hard comparison, and you likely won't find much out there. I would start with this, the Gartner Report for Critical Capabilities for Web Conferencing, where all the significant tools are compared. Critical Capabilities for Web Conferencing
From there, I would say (as a user of both Skype and Connect) here are where I see similarites and differences.
Similarites:
- They both have chat function
- They both can do VoIP audio
- They both can screen share (except the Windows 8 App version of Skype cannot)
- They both can be used to share files, though how they do it is different
- They both can record sessions
Differences
- Skype would require an install for every user (Skype must be installed to use it)
- Connect doesn't require an install (only requires a web browser and Flash 11.2 or newer to be installed which 98+% of computers have installed)
- Connect has more functions and the ability to build custom applications to run within a Connect meeting room
- Skype is a good internal communitcations (IM) tool for businesses
- Connect is a good web collaboration tool
I'm sure the list can grow, but ultimately my oppinon is that they are two applications that meet different business needs. For the last 8 years I have used both tools, but not found any time where I didn't know which tool would best fit my need. If I needed to have a quick chat or conversation with a colleague, I'd use Skype. If I needed to have an interactive session with someone, I'd use Connect. For webinars, I'd use Connect.
Just my $0.02