I think there will be a lot of threads started about unnatural link warnings, so shouldn't we make a sticky about it?
But I guess to do that we would need a general consensus and a helpful guideline on the matter..
This is just my opinion and current thinking, I could well be wrong.
There are two different types of warnings, one for unnatural links pointing to your site
I believe you might get this warning if your link profile is unbalanced, such as to many bad sites linking to you, over optimized anchor text or just totally irrelevant sites linking to you.
My thinking for this warning from experience is do not file a reconsideration request if your rankings haven't been affected.
The reason for this is your site will be manually reviewed, will your link profile stand up to human scrutiny? almost certainly you will have links devalued at least.
I received this warning of unnatural links at the end of December for one of my sites, I didn't have any change in rankings, I actually didn't see the warning until two weeks later in January, I (without making any changes and confident my links were fine) filed a reconsideration request, after I did so my rankings dropped, not hugely, but noticeably, I believe some of my links were devalued.
So again my advice would be not to file a reconsideration request, but to stop all link building that could be considered "unnatural" and focus on ways to bulk out your link profile so that it does look more natural.
This is the other unnatural links warning for links on your site
This warning I don't know to much about.. I believe it can be given for to many reciprocal links and/or for linking out to bad sites..
For this If my ranks hadn't dropped I would not file for a reconsideration, but I would go through my site and get rid of every single outbound link that might even possibly be causing the problem.
For both warning this is just advice if you haven't had a penalty and your ranks have not dropped if they have then you will need to make yourself as squeeky clean as possible, make all the changes that you can and list them in your reconsideration request.
So yeah that is just my opinion from what I know.. thoughts? btw I'm not saying I think this post should be a sticky, just opening debate and asking for opinions so that we could possibly make one