I just finished cataloging the current content.
You can find it sorted by country in the menu "Categories".
Well, there are some states/regions (like Bavaria, Moldavia, Trieste, Alaska, so on...) that have too many occurrences, and that's why they've their own category, and aren't in the original country one.
There are also some countries that have so few occurrences that I put them together by continent (like Pakistan, that's in "Asia", or Marroco, that's in "Africa [North]").
Finally, there are several national blocks flags that have their own category (like EU, UK+France, Baltic States, Scandinavia...).
You may also find interesting content in the category "Download".
I recommend you to use the Ctrl+F (find) command of your browser, so you may find in the Categories menu (over than 250 entries in alphabetical order) the country/state/region that you're looking for. If you don't find it there, you may find it in the country or continent where it should geographically be.
About sort it by author or style, I think it would be very difficult to do now, since many flags have various options of style and/or authors in the same post... Anyway, you can always use the search tool present in the blog to find flags made by a specific author.
I will stay tuned in this thread to post new flags as they keep to pop up. For mod's flags and such, I don't know, maybe I can catalog some if they're published in a website or forum.
ps.: I also will have some new flags requests of my own for next days.