If you really need to download the .deb then you should have just followed a link in the links I provided above,
http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu/pool/main/w/wine1.2/
there is another neat little trick you can use if you want the .deb that I will explain in a moment.
this is useful for if you:
-cant find the .deb,
-need to install lots of software, and only want to download it once. This is useful if you ever need to format and dont need to go through all the hassle of downloading everything again, or need to install the files on multiple computers.
-your computer is not hooked up to the internet, and want to download a few files from someone elses ubuntu pc...
1) go to system/administration/synaptic package manager.
2) search for the file you want to install, for example wine
3) mark it for install, by checking the little check box next to the items. (you can select as many items as you want- not limited to only one)
4) click file/generate package download script.
5) it will ask you where you want to save it to- select a folder on your hard drive.
This script is a record of all the .deb files you want to download.
all you need to do now is run the file (you can run this from any ubuntu pc).
it will download all the .deb files you chose and place them in a single directory.
now you can either install each separately, or you can start a new session of synaptic package manager (with nothing selected)
file/add download packages
point to the directory where the .deb files are kept and they will all be installed.
very useful little trick