A number of works on the go. The ones that are most focused at present (given that a work can hang fire for many years) are a multi-movement sonata in C for harpsichord, of which movements I, IV & V (finale) are posted in various stages of completion:
The first movement more or less wrote itself, which is unusual for me. Interestingly enough, it started as an example I wrote to illustrate an answer to a question on music.stackexchange.com, something to effect of "Is it possible to use the cycle of fifths in the Phrygian mode?" (Found here. I finally got pissed off enough about Stack Exchange's bureaucratic ways that I nuked my account, hence the system-generated user name. The "Prof Steve" referred to in the answer not only nuked his account, but nuked his posts as well, quite a bit before I lost my stick.)
I have sketches for an Adagio in E Phrygian and a Gigue in C major that will form movements II & III respectively, so the overall arch will be C Phrygian (secondary keys of E phrygian, F major & G♯/A♭ Phrygian, plus major mode at certain cadential points) - E Phrygian (I suspect G major as the secondary key) - C major (conventional C -> G movement) - A Phrygian (with a strong hint of F major/minor) - C major (E♭ as the secondary key).
@Haystack, the first movement shows one way of dealing with block - use an exercise to get started, then pound on the germ of an idea that the exercise provides until the idea becomes expressive. (The other movements show another way of coping - have many sketches on the go. )
I've also got a pair of chorale preludes on the go, a second one on *Aus tiefer Not schrei' ich zu dir", and this:
Some of these sketches do a good job illustrating why it's a good idea to have a lot of sketches on the go. The Gigue for the sonata, for instance, has been kicking around for over a decade. The organ prelude on Alle Menschen müssen sterben here wrote itself while the two larger preludes were hanging fire. I find that, if I have to interrupt a piece to do something else, it is very hard to pick up where I left off - the piece has to "ripen" then, it seems. The interruption doesn't have to be long to derail me; it just needs to demand my full attention. <sigh>