I’ve been looking for a GPS data logger too, and here’s what I’ve found. There are a couple of iBlue units, the 747 and 757, both available in Oz:
http://www.exploroz.com/Shop/DisplayItems.asp?ItemID=1242
http://www.exeltek.com.au/secure/catalog/product_info.php/products_id/1067

Windows software only, unfortunately, but I did come across a Java app on gpspassion.com which provided partial support on Linux. The MTK chipsets they use reportedly aren’t as good as the SiRF III at tracking at low-speed (e.g. walking).

The BGT-11 looks good, and if it had a SiRF III chipset I’d buy one.

If you’re willing to do a bit of assembly, Spark Fun Electronics have a simple GPS logger using a Globalsat SiRF III module and an SD card:

http://www.sparkfun.com/commerce/product_info.php?products_id=8237

They have other GPS modules too, including another logger using a Trimble chipset.

Finally, there’s gumstix. Their basix cpu with gpsstix will do the job, but at a much higher cost than any of the other options.

For me, it’s a toss-up between the BGT-11 and the SFE GPS logger. Maybe I’ll have to buy both …

I’ve got 2 GPS’s so can only compare those,
Holux GPSlim 236 (New brought off ebay):
Is a receiver only so will need something to record to via bluetooth(or usb i think) (i’ve only connected it to a pocket pc with bluetooth but guys from the local lug have used it with various devices)
Charges via USB socket (comes with mains charger), is very good at getting a lock on your position in weak signal areas (under trees etc) but sometimes isn’t as accurate in those conditions. (Cost about £50uk)

NaviGPS BGT-11 (the bluetooth version):
From http://www.storagedepot.co.uk for the UK but there are other sellers i believe for other parts of the world. (cost about £80uk)
Connects and charges the same way as the one mentioned previously. Can receive and pass on the data to a computer (linux drivers are available, possibly even built in – my laptop lacks a bluetooth receiver though, the driver download contains sources for a module called pl2303. But i just modprobed pl2303 and it loaded in a stock ubuntu without installing/compiling the downloaded driver)
This device also allows you to record the tracks to a SD card (but can be picky about which cards it accepts and the formatting of the card) also it has internal memory for storing tracks too but i don’t think there is yet a linux driver to remove tracks stored internally. It has a b/w screen so can be used as a navigation aid and can have waypoints and routes programmed in, but you can’t upload a map to the device.
In comparison the tracks it stores are quite accurate (better than the NaviGPS often) but it is more prone to loose signal and won’t work in a covered area nearly as well, first time i brought it i was standing outside for about 15mins till it found it’s first lock, but after the initial setup it was only a few mins there after.

I would recommend the NaviGPS (or Garmin equivilent) if want a GPS that can be used standalone (handy when you don’t want to take a palmtop with you on a rainy day which was my reasoning)
I would recommend the Holux GPSlim if you want a small receiver thats cheap and has no unwanted extras, but yet is very capable at it’s job.

If you want to support openstreetmap there are some suppliers that will donate part of there profits from your order to openstreetmap. (http://wiki.openstreetmap.org/index.php/Merchandise)

Sorry for the extra long comment, Daniel

P.S. It works with Ubuntu