For anyone with much luggage contemplating inexpensive options - the Roissybus will take you from CDG to Opéra for €8,50. From there, you can walk, taxi, bus (9 lines) or Métro (4 lines) to your hotel.

Robespierre,
On the Air France bus they put the luggage underneath the bus in a storage compartment. Is it the same on the Roissy bus or is luggage taken on the bus? I liked the Air France bus, but my husband didn't like losing sight of our luggage, especially as we had a stop before our stop at Gare Montparnasse.
Sandy

You take the luggage aboard, and put it in large bins, so it is constantly visible - think rent-a-car shuttle.

Hi. I've stayed at a hotel at Charles De Gaule that has a metro station right under the hotel. It's a really nice and fast train that takes you to another metro station where you can make all your connections easily. Can't remember the name of that hotel, wasn't expensive and was nice. It should be posted somewhere on internet.
Metro system in Paris is fast, and their maps easy to follow. You'll be amazed how efficient metros, trains really are in Paris. Beware of pick pockets on trains and where ever you go in Paris. Read up on how they operate and don't pack too much on metros. Have a great trip.
RM

Hi, we have recently returned from Paris - spent 4 nights there in mid January. We arrived late at night at Orly airport from Italy and just decided to get a taxi - sooooo glad we did. Cost was only 30 euro from Orly to the Republic district and money well spent. The next morning we dedided to bite the bullet and use the underground (the only quick way to get around Paris). After reading the signs etc, looking at the maps, we worked it out. It's pretty easy and the lines are colour coded. It was great, quick and efficient. We NEVER had to wait longer than 3 minutes for a train - it was incredible, even late at night. I can highly recommend it.

It was just as easy the night before.:)