I took my Tau to Small Arms 2011 today and managed to win.
List was:
FW + FW + Pathfinder + Ethereal
Mech FW + Skyray
Crisis + 1 Crisis + SC
Broadsides
Stealth
Recon (3/3 split)
Recon (3/3 split)
Fusionheads + Fusionheads + Skyray
Railheads + Railheads
Barracuda Squadron
A couple of things stood out for me, Yme.
Fire Warriors - My jury is out on these guys really. I can't ever seem to make much use of them tactically (except as road bumps) before they're smashed apart by harder infantry formations. I thought today's strategy was solid and they ended up broken and crippled with very little to show. Can't figure out what I'm doing wrong really. It must just be my luck as i can't work out why. Hopefully I can do something decisive with these guys one day. They've yet to show me that in any of the games I've played with them either in FF assault or in shooting. They get bucket loads of shots yet they still often fail to achieve anything of great note. They look dangerous but boy are they girly-fish.
example: I took 12 FWs + 2 Pathfinders + Ethereal for my BTS. When assaulted by 7? World Eaters+lord, out of 11 possible Pulse rifle and carbine (on 3+ & 4+ for MLs) OW shots
and the ensuing assault I managed to kill a single berzerker stand (good saves here by the boys in Red BTW)! Thank heavens the Recon group was there to provide "heavy fire support" with 2x 6+ FFs (thus confirming their 175 point price tag...

) and tip over a couple more berzerkers. Even the support fire from 2 crisis suits nearby and 4+ cover saves didn't help. In the end I lost the engagement and the 5 surviving FWs ran off and failed to rally in the last turn. Pansies! Well at least I managed to keep 5 alive thanks to the Recon group otherwise there would have been only 3 from 14 units left. Soft! Thankfully the berzerkers were broken after the assault but it wasn't because of the FWs.
Rail Gun HHs - They're still just on the
meh side for me - even with 6 in the formation for 300. They just never seem to hit the enemy's hard units very hard. Don't get me wrong they're a great stand off ranged weapon - if you're shooting Eldar tanks or APCs. Fusion heads OTOH, now they're the beast the Tau need - they are shooty death. I wish I had 3 formations of these things. 4+Fusion heads are now a very nice formation (well if you can get them to actually activate.

In 9 turns across 3 games I rolled 1's 7 times to use these guys! Including SC re-rolls, rallying and just simple activating)
Stealth group - spiffy troops but an enigma

. They're like gnats - mostly annoying but sometimes hard to kill. They died like flies versus a guardian formation assault with Wraithguard support... but they tied up a WE terminator teleport team (and broke it with disrupt albeit after the termies landed with 2 BMs) and soaked up a Chosen assault to hold the Blitz from turn 2 to the end of turn 3 and distracted the Banelord as well. I wish I had more of these minis

One last thing - Pleeeease increase the size of the reference sheet in the back! Ohhh, my straining eyes!!

Overall though, the list is pretty good now. Well done.