I would suggest having a folder/forum dedicated to Macro Photography. It is a high interest area and the discussions and images should all be located in one spot for enthusiasts.
There is a flowers and insect thread that you can use - if you have not done so already. There is also a macro lens section. It may be reduntant to have a Macro section by itself. Though, i will let Jdeg decide that.
The are already there under learning photography, and I view the site as those wanting to improve their skill while using Nikon equipment. The more experienced helping the less.
Or in my case the partially blind man trying to improve his own vision and helping the blind people improve theirs as well...with Nikons...thanks to Jdeg and staff! LOL
I have to agree with STMV, I joined this site because it was Nikon based and yes also to help beginners like me to improve otherwise what makes this site stand out from other sites.