I am at GUADEC now and typing from my Dell D400 laptop. The fun part is in battery — it is more or less dead but in interesting way…
For last few minutes it say that I have 3% of battery left which will give me 1 second of work. It is quite long second :)
After all the battery has enough juice to give me about 30-40 minutes of usage (with removed everything not needed like USB, Ethernet) with WiFi enabled (on Broadcom 4306 chipset). And to avoid data loss I have all partitions mounted read-only now.
UPDATE: some more facts:
11:08 — 3% battery left, 00:00:01 remaining
11:31 — 0% battery left
12:02 — still working…
12:08 — started dd if=/dev/urandom of=/dev/null to give some work for CPU. Machine stopped working
1 hour with unknown status of battery… It was enough for reading Google Reader over WiFi.