i'm using the holux gpslim 240. great little receiver (i think it's still the smallest in the world), it's about the length/width/2x depth of a USB flash drive.
takes <1 min for an initial fix if you move it a far distance, and less so if it's in the same position it was when you turned it off. has an on/off switch for extending battery life as well.
in the car, it works in the glove box or in my armrest, and definitely doesn't need line of site to the satellite with the sirfstar iii chipset. also works well indoors, provided you're not in the basement or in a large concrete building.
so far, very pleased with it, got it for $50USD + shipping on ebay, so it's very affordable. BT connects very fast, and i've had no problems with any devices so far (laptop, e61i, bb pearl). i've used it with: nokia maps, google maps (latest version supports bt gps), and tomtom6. all work well.
downsides: only comes with a DC car charger, so unless you have a USB wall charger (from another phone or say a motorola bt headset), you have to charge from the car or with the included USB cable on a usb port from your computer (it does not work for data, only charging). you have to buy a separate cable if you are to use it on your computer over usb.
[Google Nexus 4, Motorola Atrix, Apple iPhone 4, Blackberry Bold 9700, Nokia E61i, Motorola V635i, Motorola V400, Siemens A56]
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