After reading through this thread, and other threads on this board, The most active users reporting their status on the sims are as followed:

deco (send him extra 3g trays
Lost Soul
spec09
SpookyET
ranova
nvidia2008
pua-style
NewWayAround
mrhex
cyberkurajber

If I missed anyone, I apologize. But those are the names Ive seen popup in this forum, and also bothered to email Lost Soul with updates that can be seen:
http://www.aeroxp.org/lostsoul/xsim.htm

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T-mobile USA w/ Edge on the 3G iPhone

i-Smartphone - Don't bother

Universal Sim v550 Review

Virgin-Sim "High Speed" Review

Combined Preliminary Sim Results

Test it on 02.22.02

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char dumbass[128]="pasta.dat";

I'm guessing thats the new baseband included with 2.2 betas out for developers?

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T-mobile USA w/ Edge on the 3G iPhone

i-Smartphone - Don't bother

Universal Sim v550 Review

Virgin-Sim "High Speed" Review

Combined Preliminary Sim Results

yeah, the one that (at least) fixes that fail bug

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char dumbass[128]="pasta.dat";

Hi... I just go my 3G iPhone last week from switzerland ... I Live in Venezuela, so I was wondering if anyone can send to Venezuela...

I would love to try SIM solutions and give you my results

hi, I have a question. I'm planning to get any turbo-sim, and I am still searching. I've heard universil sim is the way to go but it does require sim cutting, and I do not want to cut my sim card at all. Now i know that i-smartphone does not need to require sim cutting at all, and that I should get the black one. Now, i know you can use it without having it to jailbreak it, but the only thing that it won't work is syncying it to itunes.

Now my iPhone 3G is locked to At&t. Say I want to use T-mobile using the turbo sim (which I know it will not sync itunes with that card), now if i take off the t-mobile sim card along with the turbo sim card and just inserting my original AT&T card back into my iPhone 3G, will I have any problems syncing to itunes?

Bah, tried lots of solutions to this day (i-smartphone, rebel,stealth and some cheap chinese versions). All failed to work well (though ismart* held up for 7 days ). Even had my tray broken couple of times, pretty nasty. Is there any other worthy solution I should try? Though somehow I'm getting really cautios about such things as every single sim failed the test. That sucks.

Noes, they're all fail and with the latest baseband firmware update they'll just completely stop working once and for all, for the total final ultimate epic fail

Congratulations, you've been scammed

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char dumbass[128]="pasta.dat";

You have such a pessimistic and ugly attitude.

Do you have something better?

Mine has been working perfectly for over a month now. Everything works like it should and has survived every baseband update so far.