Whilst you need administrative access to install the old MSI installer for GoToMeeting. You can however install the ActiveX control in Internet Explorer which allows you to access meetigns in a browser.

Citrix have built the new version of GoToMeeting carefully so it doesn’t require elevated priviledges to install, making deployment in business environments easier. You may need to exlucde the core GoToMeeting executables from your firewall restrictions. You may also need to add the following filenames to AppLocker:
g2mcoreinsextractor.exe, g2minsthigh.exe, g2m.exe, gtm_download.exe, appcore.exe

There are some great iOS (iPhone/iPad) and Android GoToMeeting clients, but so far Blackberry isn’t supported on the whole. Blackberry Playbook support is something that Citrix are looking at. Citrix have already built Citrix Receiver for the Playbook, so hopefully a GoToMeeting blackberry app will be forthcoming. You might be able to get gotomeeting to work through a java or browser client on a blackberry.
If you desperately need blackberry support, Fuze or WebEx may be worth a look.

Here is a quick comparison of GoToMeeting and WebEx:

GoToMeeting
Very quick registration process
Can run meetings
Runs through firewalls
Secure Encryption
Up to 15 attendees, or up to 1000 with GoToWebinar

WebEx
Pretty much the same features
Runs over WebEx’s dedicated network

Both offer solid functionality, usability and security. Costs are simliar at around 40 bucks a month.

To join a meeting with GoToMeeting just visit the join meeting link, or visit GoToMeeting.com and enter the meeting ID.
If GoToMeeting is already installed on your pc, find the shortcut called “GoToMeeting Quick Connect” and click it, then join. You may also wish to join an audio conference either through your computer or over the phone at this point.
You can also install GoToMeeting directly by downloading gotomeeting_download.exe and then running the installer.