If you never received (or can't find) your game's product key, instructions on how to get your free classic RPG, or your Fair Price Package codes (if applicable), go here:
http://www.gog.com/en/page/my_tw2_info/

Our emails appear to be still borked. We will flog the IT gnomes roundly when they show up for work tomorrow.

Don't despair, though! If you are viewing your email in a client, you can simply choose to "View source" (that's CTRL + U in Thunderbird) and see the plain text version. Here's a quick guide to how to do this is most clients.

Let me post a sample from the plaintext of the email if you're still having problems and show you guys how to find the info you need:

Here's what you should look for in order to get your fair price package code:

Fair Price Pac=
kage $16 USD instore credit
Since EU customers have to pay almost $16=
USD more for The Witcher 2 than the rest of the world, we're giving the=
m a $16 USD credit to spend on anything at GOG.com. Below you=E2=80=99ll=
find buttons to redeem your three bonus codes. If you're having a probl=
em with them, please contact support and we'll help you out.
1st cod=
e for $5.99 game: http://www.gog.com/en/bonus/#DU7-XXXXX
2nd code fo=
r $9.99 game: http://www.gog.com/en/bonus/#RU9-XXXXX
=20

Line breaks are a bit hosed, here, but what's important are the two links at the end. The new coupon system uses coded links, rather than specific codes. Copy and paste the link into your browser and you should be able to add one game of your choice (appropriate to your coupon code) to your basket for free.

In order to find redeem your free game code.

You've preordered The Witcher 2 on GOG.co=
m=E2=80=94and now you've bought it, too!=E2=80=94so here's where you can=
choose one of the five classic RPG=E2=80=99s we're giving away for free=
to everyone who's preordered. Click the link below to see the available=
games and make your choice now.
http://www.gog.com/en/page/tw2_bonu=
s/?order=LONGHASHTAGOFGARBAGELETTERS

Again, the link should be copied and pasted into your browser. NOTE that this line break (which is added with an equals sign) needs to be removed from the link for it to work. (note that means "bonu=s" should be "bonus")

I hope that clears things up for you. I'm at dinner with Guillaume and Marcin tonight, but I'll try to keep checking in to see if there are any other problems.

[[EDIT ADDING A SECTION]]

Finding your CD Key:

Look for

Using the CD-Key is not required to play, but we =
recommend you register your copy of The Witcher 2 with it as it grants y=
ou access to direct updates, additional language packs, future free DLC =
and more.
Make sure to keep this email so if you ever need your CD K=
ey again, you'll know where to find it!
The Witcher 2 CD KEY: BLAHBLAH-W=
BUPE-TXIDZ-HA748=20

Note, again: you'll need to find the extraneous equals signs and remove them.