I did one of these over in the Paris forum and thought I'd start one for Rome as well. If you have a link, go ahead and post it and I'll periodically update the first post here with the submissions. Ciao.

Walking / Sightseeing Tours
http://www.contextrome.com/

http://www.rome-tours.com/tours.shtml

Transportation
http://www.rome-shuttle.com/

http://www.limoservicesrome.com/

http://richardab.home.comcast.net/Fl...CO_Arrive.html

http://www.trenitalia.com/

http://www.adr.it/Default.asp?L=3&

http://www.romatermini.it/indexf.cfm

http://www.atac.roma.it/biglietti/co...2&Sotto_Area=1

http://www.atac.roma.it/biglietti/bi...to_Area=1&ID=4

Museums
http://www.ticketeria.it/ticketeria/default-eng.asp

http://www.galleriaborghese.it/default-en.htm

http://www.studioargento.com/gnam.html

General Information – Rome
http://www.enjoyrome.com/main.html

http://www.fodors.com/miniguides/mgr...ur_section=ove

http://www.fodors.com/rants/rrpropse...ation=rome@130

http://www.fodors.com/miniguides/mgr...ation=rome@130

http://www.frommers.com/destinations/rome/

http://www.nerone.cc/

http://www.lonelyplanet.com/destinations/europe/rome/

http://www.roma2000.it/english.htm

http://www.romeguide.it

http://www.romainteractive.com

http://www.romeby.com/

http://www.cityguesthouse.com/linkex...raveltips.html

http://www.romebuddy.com

http://www.romexplorer.com/

http://www.bangor.ac.uk/~fos007/srad.htm

http://www.sleepingrome.com/

http://www.timeout.com/travel/rome

http://www.virtualrome.com/

http://www.ku.edu/kansas/medieval/10...an_empire.html

http://www.dream-vacation-in-rome.com/

General Information – Italy
http://www.discoveritaly.com/

http://www.initaly.com

http://www.italyheaven.co.uk

Vatican Links
http://www.santasusanna.org/popeVatican/tickets.html

http://www.vatican.va/phome_en.htm

http://www.vatican.va/roman_curia/in...121999_en.html

Sites (non-museums)
http://www.piazzadispagna.it/

http://www.romasotterranea.it/

http://www.catacombe.roma.it/

http://www.ostia-antica.org/

http://sights.seindal.dk/sight/901_Hadrians_Villa.html

http://www.villadestetivoli.info/indexe.htm

Miscellaneous Links

http://space.per.sg/italy04/

http://www.tomaustin.com/Rome/Rome.htm

http://members.lycos.nl/romephotos/

http://www.worldisround.com/articles...9/photo57.html

http://kunmr2.chem.ku.edu/~dave/rome.html

http://slowtalk.com/eve/ubb.x?a=frm&...21&f=862600685