I bought the BDC about 3 years ago from eBay... it's this baby:
http://www.thinkwiki.org/wiki/Bluetooth ... Card_(BDC)
The bluetooth antenna is hidden in the left display hinge:
http://www.misi.jp/bluetooth/img/put_hinge_cover_s.jpg
I was very lucky and got that thing for only 6$ in eBay.
For a perfect bluetooth upgrade, you might want to replace the LCD clearplate with a bluetooth-x30 version as well.
Btw... there is a small "button" on the TFT-inverter directly under the clearplate. This button enables and
disables the BDC. Since it is seems to be very hard (= expensive

) to get a button-cap for this little
[censored], I just improvised a button with a thumbtack. Retrospective, this is not
necessary since you can enable or disable the BDC completely with software... both in Windows and
Linux!!! And if your Linux does not initialize the BDC (internally a USB device) correctly, a firmware
update solved the problem for me.
As WLAN replacement I bought a miniPCI card with a RaLink RT2860 chipset which is also used in many netbooks.
Since I mainly use Debian, working Linux drivers played a big role in my decision. Currently there are linux drivers
from RaLink which are also part of the kernel staging branch. They work well, but not perfect. A completely new
driver is currently developed in the rt2x00 project (
http://rt2x00.serialmonkey.com), but the driver is still very
experimental and unusable for daily work.
This is the miniPCI card:
http://www.sparklan.com/product_details.php?prod_id=170
I got the thing from:
http://www.minipci.biz
The third WLAN antenna was part of the miniPCI bundle.
I eliminated the 1802 unauthorized alert by modifying my bios file (not the CMOS). I wrote a little protocol about
the single steps, but they are unfortunately in German:
http://www.lobmenschen.de/index.php/Thinkpad_X30
If you are planning to do a similar modification, I can briefly describe the steps in English.
I also thought about SSD to replace the Harddisk, but SSDs in good quality are still too expensive for me, although
disk space is also not a big deal to me (64 GB was the minimum I accepted for disk space). So I bought a WD Scorpio
Blue with 320 GB...
@Tim: good luck with your RAM upgrade
