I have tested a ton of tabbed remote connection tools.

RDTabs (http://www.avianwaves.com/tech/tools/rdtabs/):  Like it for pure RDP, no SSH, http, etc…

Terminals (http://terminals.codeplex.com/):  Slow and a little buggy IMO

Remote Desktop Manager (http://devolutions.net/):  Over built app, not portable, etc…

I am now using mRemoteNG (http://www.mremoteng.org/):  Love it!

This fits all my needs.  Supports all the protocols that I require, no install portable version available which is perfect for me.  I have the portable version in my dropbox (http://www.dropbox.com/) folder so I can launch on any machine and have all my connections readily available.  I can add connections anywhere and they sync’d via  dropbox.  The perfect solution for me.  The app is light weight and fast, give it a try.