Pedaling Drills...all sitting? or standing also?

The only pedaling drills I've found useful are what Friel calls 'form sprints'. Basically, they are high-cadence intervals at lower power. They are useful for learning to pedal faster and staying efficient at a high cadence. When you start bouncing up and down you've reached your limit and are no longer pedaling efficiently. You don't need to do them for a long time, just building 15-20 seconds gradually getting faster and faster. I usually start around 95 RPM (my standard cadence) and build up to ~145 RPM (my limit). Hold for a few seconds and go back to my normal cadence. These are good for sprint practice too, as typically you're better off spinning up with a moderate resistance than going to a high resistance and trying to increase speed from there.

I also find low-cadence, high resistance drills useful, but this is because at some point you're going to get to a hill where you run out of gears. Usually I just find a big hill and I don't have a choice

I do both of the above in and out of the saddle, in the drops and on the hoods. I've been doing more out-of-the-saddle work lately. When you do out-of-saddle work, it doesn't have to be full power. One key is that out-of-saddle work should be a little longer than is comfortable. You'll see many people get out for 5 seconds, then sit back down. That's all they can handle. Try to go 15s, 30s, or even longer on a climb or sprint (in the drops!). One day in a race, you'll stand up to go up a hill, turn around and have dropped the whole group.

I find 1-legged drills useless.

Don't do the high rpm ones but I do the low cadence high watts rides on the trainer.  I am in the saddle for those, don't normally stand on the trainer at all.

They are typically 125%FTP for 10-15 minutes at 50-60 RPM, basically weightlifting on the bike.  Coach says it builds leg strength.

Agree, one leg drills don't really do anything. 

Thanks for the replies