The way I see it, Romans 14 should serve as encouragement for us as believers to accept one another, despite differing convictions in one thing or another -- realizing that one thing that might be wrong to one person might not be to another, depending on each individual's understanding of Scripture. It uses eating meat as an example, but I don't think this is the only thing that can be applied here. The first verse mentions "doubtful things", which covers a variety of issues such as Bible translations, music styles, clothing, politics, the use of playing cards/dice, and other things in which opinions will differ. It also goes on to talk about not being a stumbling block to another believer who has a different conviction -- like if someone is having a "game day" at their house, and stipulate that they don't believe in playing cards, don't offend them by bringing a deck to their home, even if you yourself see nothing wrong.
There are also a few people who might tend to think that Romans 14 is being used to justify living in deliberate sin. Yes, I believe that there are some who use the Scripture in this manner, and I don't agree with condoning wrong lifestyles in any way, shape, or form. But there are also many people who don't use Romans 14 in this manner, merely believing that it shows that all Christians are different, with different opinions on how to serve our God to the best of each individual's ability. And if we are doing that, we are on the right track. After all, as different and diverse as we are, we should all come to realize that God is our common bond, and that when we get to heaven, none of the petty matters will make a bit of difference anymore.
Anyway, that's that.