This is a very cool invention and $150 really isn't all that bad.

I'm hitting up Europe in two weeks, so I hope it's available. Anyone know any Canon-compatible alternatives if it isn't?

im thinking this probably works on a counter principle, using the hotshoe to trigger it to record the location, and as you upload the data, it sequentially tags your photos. which is fine until you decide to delete a photo or two, then i can see this going off track.

is this the same as Sony's little gps gadget thing?

i was thinking of getting it if i could really find a use for it

You can do it with any gps logger right now. Just make sure your camera time is synched with the atomic clock (where gps gets it data from). It finds the time the photo was taken, and finds where you were at that moment in the gps log file. I bought one that just logs your location in a gpx file, was only about 80, and much smaller. Although the batteries only last about 24 hours, and it fills up in like 8-10.

Looks pretty handy and cost effective.
If it can tag RAW files as well as JPEG they will have a winner on their hands...

@Hoffen:
It uses EXIF data to match the time the photo was taken, so it can match up like that. Which presumably may confuse things a bit if the times on your camera and GPS module are off and/or if a lot of picture are taken in a short time (i.e. continuous burst mode), but presumably you will not have moved much in the span between those photographs, so as not to affect the GPS data very much, if at all.

Yeah, but -- what if you need a flash?

I thought this would be great at first, but then realized the extra software step made this nothing new. I'm currently geotagging by using a cheap garmin unit, downloading the tracks and stamping them with the WWMX uility, WWMX Location Stamper. Like everyone says, as long as the clocks are in sync, it's quick and easy. Plus for about the same price your GPS receiver has a full screen and doesn't make your camera heavier.

link for those that are too lazy to google those utilities:
http://wwmx.org/Download.aspx

I've been doing this for over a year using a portable GPS receiver, several different off-the-shelf digital cameras, and free software that tags the photos with the GPSr's data. Simple, flexible, and you can pick up a basic GPSr (make sure it has a logging feature) for under $100.

What cellphone cameras do this without an add-on?

I bought an iBlue 747 gps logger for exactly this reason. Its on its way to my house now.

http://www.semsons.com/i747bldalogp.html

Plus it acts as a bluetooth receiver for your notebook/pda. it was under 100 bucks.

I have too much trouble doing these things in multiple steps - Much nicer when you can put the GPS data into the EXIF data right when the picture is taken (RedHen makes such a unit for Nikon cameras - been using them for years).

What about a memo button on a camera that lets you leave a voice memo about the last photo taken? Sounds a lot better than dragging that around. Maybe too simple.

For in-EXIF solutions, either you need a camera with built-in GPS, or a camera with an option plug for GPS (which you attach either a regular GPS to, the official accessory, or a third party one). Otherwise you have to correlate the photo to location when you transfer them.

Given my perchant for being lazy and not copying photos for a long while, I don't see using this as an option...

I've been using a solution from GiSTEQ, quite easy to use and has functions to organize your photo as well.

http://semsons.com/qiphfordicag.html

I just bought a GiSTEQ PhotoTrackr and I really enjoy it. The coolest thing is that I can export Geo-tagged photos and share them in all other 3rd party geo-mapping websites.