Blogoforum - Maintaining consistency and organization while tagging

I'm adding a framework for tagging into some commercial software, and I wanted to anonymously get some anonymous opinions. I should begin by saying my goal is to keep things consistent and organized, as that is very important with the software I'm working on; the user often has to deal with thousands of objects, and sorting/searching/organizing reliably is both important and necessary.

Plural vs. Singular, Capitalization?:

I have a cooking blog, where I post my kitchen misadventures and favorite recipes. Sometimes I tag my articles with "Recipe" and sometimes with "Recpies". The site I use for blogging regards these as two different words. Is this typical of websites/software that makes use of tagging? My question to you is: in your opinion, should searching for the tags 'recipe', 'Recipes', and 'Recipe' all return the same results?

General vs. Specific? :

In my cooking blog, I sometimes tag an article with "Breakfast Recipes", because it's an omlette or something, which is conventionally enjoyed in the morning. Sometimes I just tag something with "Recipes", because it's an ice cream sundae or something, which is generally acceptable at any time of day (or damn well should be). My question is, in your opinion, when my readers search for "Recipes" should things tagged with "Breakfast Recipes" come up?