[Galaxy S I9000 General] GwynBleidd:
Here's my small report.

1. My setup:

- Hungarian SGS I9000, bought in June

- Doc's v6.2

- JPX | JPY | ZSJPE modem (see below)

- K12C-500hz

- Gingerblue theme with samsung locksreen

- no other stuff like extended power menu, outside battery icons, etc

- around 65 apps installed, 5-6 of which are stock samsung stuff (from addon package)

- all tweaks except cifs and vpn enabled

- ext4 /data,/dbdata,/cache using 'faster' mount options

2. My usage pattern:

You could probably call it 'very light' compared to some other people. I don't use 3G; wifi is off most of the time (I work at home and got a desktop, 2 laptops and a netbook, no need for wifi on phone mostly...); bluetooth is always off except for when I need to have a really long talk - I use a headset then. Auto sync is off, I sync manually from time to time.

Things I usually do include occasionally turning on wifi to get email (Gmail app), weather (daily briefing + go weather), look in market, do some browsing, watch some youtube. Shooting pics and videos, listening to music, using GPS to navigate in my car - I do all that too. Some amount of games is present, like 10. I do get a lot of voice calls though, usually 1-1.5 hours per day.

I don't use any autokillers (I kill tasks myself from time to time with ES task manager) and I've got 3 widgets running: retro clock, retro date, switchpro. I'm using Zeam.

My screen is always on autobrightness and I do use a darker theme/background.

I haven't ever got as huge of a battery drain as some people describe here, not even close; but I did some observations and found that some setups were draining more than others. After noticing that for me the drain was mainly wifi related, I did some tests watching battery status with wifi set to always on, screen off, 3g off. I also tried to place phone always in the same place so wifi signal strength was similar.

My wifi access point is Asus RT-N13U operating in b/g compatibility mode (I still have a couplea old G devices).

Here's my recent history based on Doc's v6:

First, it was v6 JPX based with its standard Voodoo-5.0.3JPX and JPX modem. With that setup, I was getting what I called a huge drain with wifi on:

---1% every 4 minutes---

Then, I reflashed back to speedmod (which I always preferred), version K10K (the one based on JPM sources), and it alone brought me to:

---1% every 7 minutes---

Then, I cleared all thumbnails, all gallery stuff in /dbdata as well as in sdcard/android/data, fully discharged battery, recharged in the off state to 100%, wiped battery stats. After this operation, nothing really changed and I was getting still

---1% every 7 minutes---

Then, reflashing to v6.* JPY + JPY modem + K10K alone has given me a result of

---1% every 10 minutes---

After that, I upgraded to K12 based on JPX sources - with new drivers - and it slightly improved to be

---1% every 11 minutes---

Then hardcore went ahead and made K12a, which has brought me some more improvement (probably due to the fact that he removed unnecessary error logging):

---1% every 13 minutes---

After that, I decided to give ZSJPE modem another go (tried it before and was disappointed with how GPS worked), flashed it, and, besides getting pretty good results on GPS (surprisingly), I also came to

---1% every 16 minutes---

And finally, the newest K12C seems to be a (very slight) improvement in terms of battery, so now on average I'm getting

---1% every 17 minutes---

That's the history. Please take into consideration that due to the huge amount of factors causing drain, this cannot be exactly accurate. My measurements were definitely not exactly accurate as well. But the whole picture should be somewhat close to truth (for me); remember, it might be completely irrelevant for you because of another carrier, access point vendor, different SGS version or even freaking Moon phase.

That being said, Merry Christmas to everyone!