Your question is pretty vague, as you havent mentioned a few things...important points that affect what program Id recommend are
- is audio quality an issue, ie ac3 etc etc
- is it just divx, or are there xvids, avis, rmv files as well that you want to convert....not all software converts all file types.
- are you looking to make menus, ie, putting two episodes of whatever youve downloaded onto a dvd, you are going to want a menu
- how good is your pc..this is critical, as the processing power required to convert file types is significant, and the difference between an old p3 and something state of the art can make an incredible difference...plus boat loads of RAM is useful.
- what quality are you after, and what is the quality of your source video.
Seriously...can go on and on with this.
In saying all that, a great place to immerse yourself will be www.dvdrhelp.com (the site has changed, but this url still redirects there)
But, to give you an actual quick answer, I use WINAVI video converter for quick, not to fussed conversions, and it is very quick, typically taking 45 mins to convert 2 hours of xvid, has a very simple interface, and can batch files which is nice...but the results are what youd expect from such a quick process.
Procoder2 gives excellent results, but is much slower, and its pretty expensive if you buy it. TmpGenc is a big forum favourite, but is less intuitive than the others...there are heaps of guides though, so dont sweat it.
There are many others, check out that website, browse thru the tools and look at some of the user feedback, then give one a go.
Good luck
Gav