Yesterday night I found a nice product
Eye Fi, which is a merge of memory and Wifi module in SDHC form factor. Costs about 50 usd / 60 EUR, available in Europe on German Amazon/Ebay.
There are other companies suggesting pure WLAN SD solutions, the keyword is SDIO. Too bad there's no memory+wifi in microSD, only pure WLAN inside microSD -
Spectec SDW-823. Otherwise I'd buy one for my DR800S.
Same SDIO bluetooth is
available for 20 usd. Do not know if there's a solution memory+bluetooth.
Regarding drivers a bluetooth device should "just work", linux has a nice support for this. With wifi "it depends", hopefully the chipset is supported.
edit: hmm, 4 days ago the guys put on Sourceforge a
patch for SDIO on 2.6.24 kernel. Even more interesting now ..