This doesn't really deal with Dominion strategy, but it still needs a mention. The Fan Card Creation guide could use a facelift. It mentions outdated cards like Coppersmith, Chancellor, Adventurer, Tribute, Theif. A design guide should try to not reference outdated cards if possible. Also, some of the wording is outdated.
It could be expanded with references to more recent material.
-Clarification on the use of the Reserve type. When to use a Duration instead, when a Duration should be a Reserve, why Miser isn't a reserve, etc.
-Some advice for Events. Specifically, on making kingdom card piles into events.
-Explanation of Landmarks. A lot of times people will try to do anything a landmark.
It could explain some more common pitfalls.
-Making cards strictly better than silver for
, or action-silvers.\
-Not ability related, but people will often use a Blue-White template for a reaction.
It could talk about common fan card tropes and link to discussions about them.
-Card/Action tokens. In fact, you could have a whole article about this.
-Negative actions or buys.
It could mention some wording tips.
-What to make bold and when. Also, Italics.
-What terms to use, like "trash", "gain", and "buy". It touches on this, but still other stuff.
-Often times people will use "Can" instead of "may"
-Card types and names should be captial.
It could link to fan card creation tools.
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Dominion card generator. Bolding this because even though I prefer GIMP, this is a really great tool.
-GIMP templates, for people who might want to mess around more.
-Good art resources, and some tips on how to find good art.
-Minion Pro STD is not a commercial font. In fact, linking to all the fonts would be nice.
I might think of some stuff to add to this, but I think the creation guide could get a facelift too.