Ouch, j'avais pas encore lu ça :
CITATION
Can I switch to a new machine and still have my games?
Yes, but only if you have purchased the Extended Download Service (EDS). EDS essentially allows you to download your purchase again for up to two (2) years, in the event your computer crashes or the downloaded file becomes damaged or corrupt. It can be thought of as an insurance policy in case anything goes wrong with your computer or the downloaded product. When you have downloadable items in your order, you will see a link to add EDS to your order on the shopping cart page or the checkout page. Upon payment of the specified fee, Digital River, Inc. ("DR") agrees to provide you (the "End User") a service that enables the End User to make multiple downloads of digital computer software products (a "Product" or "Products") purchased in a single order (an "Order") and downloaded from this Web site (the "Site") for a period of two (2) years after the date the End User purchases the Product (the "Service").
To purchase EDS for download products in a completed order, you must look up your order and complete an additional purchase.
You are also allowed to activate your game up to 3 times with a single serial number.
How will GameAgent.com handle piracy issues?
Each game that you download is, by default, locked to your computer. A game can only be played on the particular computer where it has been authorized.
En gros, c'est l'arnaque

Si je change de machine, je suis niqué, sauf si j'ai payé pou l'EDS en plus...
Si je change de disque dur, je suis je veux refaire une clean Install, supposons que les 3 arrivent, au 4è, plus de jeu possible...
Bon, ben je suis 'achement moins tenté du coup, j'attends mon DVD...
On a beau critiquer Valve avec Steam, mais au moins, une fois le compte lié aux serials des jeux, tu peux réinstaller autant de fois que tu veux, et même sur 2 ou 3 machines, du moment que tu n'y joues que sur une seul en même temps.