Galaxy S cannot be flashed with Linux
One additional remark: The Samsung Galaxy S is one of the very few Android phones with front camera — and unfortunately it cannot be updated using the SD card. Instead a proprietary Samsung application "kies", running only on Windows is required. This application does not even run with "wine", according to some postings in the net.
The Dell Streak and the EVO seem to allow "OTA" updates, but the Streak is far too heavy to count as a telephone (218g vs. 118g for the Galaxy S or 170g for the EVO). The GM DSTL1 seems to be unavailable, at least in Europe.