Begged to be open

The crystal doorknow gives you crystal clarity any time you get into a room. The manufacturer has several other variations on this as well.

http://www.globalsources.com/gsol/I/Door-knob/p/sm/1000557619.htm

Brick and mortar

This is a rather unique lighting concept - the glow brick looks like a light bulb embedded in plastic, while in fact it's a glowing phospherous orb in an inverted structure that looks like a bulb. I actually have one of these, and it looks awesome!

http://www.theplasmacentre.com/gadgets-and-accessories/gadgets/glow-brick.html

Control Freaks

The Paramote, designed by Mac Funamizu is clean and sleek, and I really hope it someday becomes a real product. The magnetic charge station is also quite fantastic.

http://petitinvention.wordpress.com/2011/02/28/user-interface-concept-universal-remote-controller/

Rodent problem

Naturally, a clear keyboard is only half the job, and this mouse makes it well done...

 

http://www.transparentcomputer.net/mouse.html

 

Key to happiness

Most keyboards are ugly as hell, but even those that aren't, are still bulky and big. This little piece of tech is just the opposite...almost invisible!

http://www.okokchina.com/p/ZZ-Other-Keyboards/Transparent-keyboard-457450.html

Your biggest fan

While not technically transparent, the Dyson Air Multipllier's design is as close to that as possible. I actually have one on my desk, and pretty much everyone HAS to pass their hand through the opening to see if it's REALLY empty (and it is!)
Quite awesome tech, if I've ever seen one...

http://www.dyson.com/fans/desk/am01-10-range/am01-desk-fan-10-white-sil.aspx

Heads up!

Transparency doesn't only LOOK good, in some situations it could actually save lives. When driving, looking away even for a fraction of a second could be dangerous, and so this Heads-Up-Display by Pioneer is both cool and safe.

 

http://www.pioneer.eu/eur/newsroom/news/hud/page.html?

The pioneer is a tad pricey at around $1000, but Garmin's solution might be a more economic option:

For $150, this unit connects to your phone via BlueTooth, and talks to Garmin's navigation software. Then, it beams the data onto a special transparent film that you place on your windshield.

Don't lock now!

You probably wouldn't really want people to be able to see-through your lock, and these beatiful and naked machines are actually designed for training purposes (for locksmiths). Then again...if you're a TRUE exhibitionist...

http://www.lockpickshop.com/BTT.html

Take a seat

The Arthur transparent chair not only is beatiful, but also allows people to see how you look from beneath...like this cat:

 

http://www.cozydays.com/outdoor-furniture/dining-chairs/arthur-transparent-polycarbonate-arm-chair-clear-17702.html

For more transparent chairs of different styles:
http://www.cozydays.com/outdoor-furniture/transparent-chairs/