Explore Worldwide
Walking and biking tours including regions like Tuscany and Umbria

http://www.exploreworldwide.com/worldwide/destinationeurope.jsp

Enjoy Rome
Rome based walking tours

http://www.enjoyrome.com

The Dark Heart of Rome
Nightly tours of the Eternal city
http://www.thedarkheartofrome.com/

Anne in Umbria
Personalised tours of Umbria

http://www.annesitaly.com

Romeing Tours
Walking tours of the ancient city

http://www.romeingtours.com/

Dreamwater - Venice

http://www.dreamwater.net/venice

IBikeItaly
Florence based company featuring tours through Tuscany

http://www.ibikeitaly.com

Peregrine

http://www.peregrine.net.au/europe/index.asp