HP Fanfic challenges I must do someday:

[azurelunatic]

Finish that MPREG, where the MPREG is actually a plot point that has a reason to be there, rather than Author's Personal Kink. (MPREG is a squick of mine, actually.)

Write some good Ron/Hermione.

Write some Ron/Draco.

Write some good Sirius/Remus.

Now that Ginny is evidently to develop a personality, write some good Hermione/Ginny.