YouAreTV or the several other places that carry video clips. Go here & scroll down to "How do I get footage from a DVD, and convert it?".
They recommend using a program called AutoGK, their link did not work for me, so here's the AutoGK link if anyone needs it.
I have not tried it yet, but I have been on the lookout for this type of info. for a while. Thanks YouAreTV.
If anyone else has info on converting DVD footage for web upload, let us know, use the comments field below.
Of course it goes without saying: don't use the tools to violate copyright, just to upload your own stuff/stuff you created or stuff you own the distribution rights to.