Just to mention, Microsoft office offers some pretty nifty services in this regard. Check out Office Live Small Business. You get a workspace with 5Gb of file storage. You can view docs, ppts right in the browser and with a plugin you can edit them right on your desktop MS office.

There's also Live Mesh service (seperate 5 GB) that allows you to sync files across different computers. You can use it as a documentation, file sharing tool. .

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We have a Team of 5. We started with a google based solution for now.

Conference Calls: Skype 3$ accounts(to dial into US) + http://www.freeconference.com/

Mailing List: Google Groups

Collaboration: Google Docs

Scheduling: Google Calendar

Project Mgmt: Google Sites (with different task list), with widgets showing our docs + calendars on google services.

Files: Google groups has 100 MB, so does Sites.

VCS: git/svn on pvt server.