Activities to hone music-reading skills

I wrote this a couple of days ago yet neglected to post it (didn't feel finished? so what, post it anyway...):

One thing I've been doing is mentally breaking down the skills that get called upon in reading music, whether a prima vista or at one's leisure, and figuring out ways of honing these skills individually, with computer/internet trainers, and by creatively different ways of approaching and learning from the variety of sheet music & recordings I have floating around my life/computer.

There's a lot of interesting material at PianoWorld and elsewhere on the internet about the characteristics, actions & perceptions of skilled and unskilled sight-readers, from self-reports to outcomes of studies. Having recently figured out that musical literacy seems to be a primary goal of mine, I've enjoying reading them and trying to extract an awareness of the many skills related to fluent music-reading, and think of ways to isolate these skills in order to practice them individually.

Perhaps it would be optimal to hone them all at once by doing infinite sight reading (though I'm not sure about this), but I find that merely accumulating sufficient "fodder" for prima-vista perusal imposes a financial limitation. But in addition, I find that my attention span is extended by cycling through different learning/self-testing media, and I think there's perspective to be gained by viewing a task from a variety of different angles -- correlating the perspectives re-enforces basic patterns, if that makes any sense.

As examples of the kind of things I'm talking about, there's of course Practica Musica and the various web-based trainers I use. But I was thinking of  things like taking the sheet music that's too hard for me to sight read, and doing things like:
* go through and just identify intervals as quickly as possible (like in hymnal or chorale)
* tap out the rhythms, one staff in each hand (in music with one voice per hand)
* look at a measure, then look away and see how much of it I can reconstruct from memory (practice for reading ahead when sight reading)
* play through an unfamiliar piece at the keyboard, not sight-reading, but letting rhythms slide a bit, repeating bits as necessary to achieve musical sense, and focusing on hitting correct notes
* play along with a (slowed down) recording of a less familiar piece, concentrating on real-time reading -- prioritizing playing in rhythm on major beats
* reading along with a more difficult recording (just reading, not at the keyboard), following the rhythms
* reading along with a recording (not at keyboard), looking and listening to be aware of what scale degrees the music is moving through, as well as listening for the melodic & harmonic movements that correlate with the patterns of theory visible in the notes on the staff -- which entails recognizing intervals, chords, broken chords, etc.