TransSystem's iBlue 747A+ is the first compact GPS DataLogger to offer AGPS support via the lastest MTK v2 (MTK 3329) GPS Chipset. Rated at -165dBm it is very sensitive and can be used indoors too. I had my hands onto this little gem within weeks of it being launched (in fact I had to import it from Semsons USA as it was still not available in HK)
For a little more detail, check here