I'm ridiculously obsessive when it comes to fonts and I've seen a few which aren't in the list. The main one is SecretScrypt. For the GoF entries I found it matches pretty much perfectly to Cedric's Entry and it's the font used in Sirius Black's Letter in the OotP. Fleur's Entry in the GoF is remarkably similar to Cardinal except for a few extra flourishes but in creating replicas the flourishes are pretty easy to add in by hand. Krum's entry is extraordinarily close to Wild Script whilst the entry written by Crouch posing as Moody and entering for Harry (LOL) is P22 Operina Fiore.
On some less literal but still very close notes Lily's handwriting in the letter images found online is very similar to Havlova-Austral or a similiar font. This one isn't exact but it's got a very similar style. On a similar note I couldn't get an exact match for McGonagall's signature but Prophecy Script came very close to getting it right. The Chocolate Frog Box also has a look-a-like font too in PlainGermanica which gets remarkably close to the exact version.
(I'm sure this has been mentioned but I'll say it anyway just in case. Appropriately A Theme for Murder is the font for Umbridge. It does her signature perfectly!)
And finally (then I'll stop rambling) two fonts which are free versions and very close to paid versions. Cuban is a free version of a font used in some logos for the Ministry (Like the DIMCO logo). There are paid versions but this one is almost identical to the paid version. Lindisfarne is almost identical to the font used for the title page of Beedle the Bard and is free to download, the differences in both cases are negligible.
My request are the notes written by Dumbledore and Luna. Dumbledore's first note is left with Harry as a baby and the second is received by Harry at Christmas with his invisibility cloak. Does anyone know what font this is, or is it just handwriting by someone on set and not downloadable? The same with Luna's Lost List - is this a font? Does anyone know what it is?
BTW...what a great idea for a thread! I reckon that part of what makes the HP props so fun/frustrating/amazing is the incredible array of fonts. Thanks to all those who add fonts for the rest of us, it saves us SO much time! If we all contribute a couple of font solutions for things we'll soon have a comprehensive list and won't that be cool!
- - - Updated - - - alib1149 As I remember, you were asking for Quadrille 2 font. Right? I've actually the same font but only with uppercase characters. http://ufonts.com/fonts/stereopticon-regular.html