We have recently had a chance to get a hydraulic piano bench. It is very useful because it is much faster and easier to adjust the height of the seat. Also, this particular bench has another important advantage - it has 2 separate seating parts, so it is very useful for teacher with a pupil - they can adjust the heights separately.
Watch the video to see how it works!

Here is also a list of 'single' benches: 

Time goes by, and the technology is evolving rapidly. We are surrounded by smartphones, tablets, etc. We have to admit that they offer a lot of useful things.
Some of the things I have noticed are applications for music education. There is quite a lot of them already. Here are just a few of them that caught my eye:

simple virtual flashcards that help you memorize basic musical symbols

Musical Work Out - a Memory game with musical symbols.

improving your sight-reading skills

mostly for improving sight-reading skills, so that the notes can later be played in a timely manner

Let me know what are your experience with these apps, and which ones have you found most useful!