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Can anyone confirm that the Avalon PSU works on 230 volt too?

Yep, there are many Avalon users in EU  :). Avalon uses standard computer PSU (most of them are 100V - 240V compatible).

plug and play or dipswitch or something?

Yes, PSUs have a little switch on the back to switch between the voltages.

not all of them, thats why im asking.

modern PSUs do not have that little red switch anymore. It is automatic. Avalon uses standard computer PSU, so yes, it will work in Europe just fine.

i'm in EU, I got proper cable and proper psu.. plug and play.. right now i made a webpage, that plays a coin-drop sound effect each time it mine an euro (calculates mined btc's and current exchangerate), nice :)

in the US what kinda plug outlet would you need for 220V?

I was actually researching the same thing recently after seeing 80 PLUS having better efficiency on 230V

An electric dryer / stove socket would likely be NEMA 14 in newer homes, where there are two 120V lines with 180 degree phase difference, creating 240V.  Older homes would use NEMA 10.

I found these adapters (http://www.evseadapters.com/products.php) which are meant for electric vehicle charging.  Then you could use a rackmount cable (http://rackmountpdu.com/Category/120-l6-30p-to-c13-power-cords.aspx) to connect to the PSU.

What's been stopping me is that the 2% gain in efficiency is only worth it if you are drawing a lot of power, having to put the machine in a specific room or pay an electrician to wire another socket to the room you want.

You *could* use a dryer plug (NEMA 10, or NEMA 14) but that'd be complete overkill.
You would be fine with a NEMA 6-15P. (Rated up to 15A at 250V, far more than a single Avalon will pull)

Converting a 120v circuit to 240v yourself is actually pretty easy, you just need to make sure you account for everything on the circuit.  Most residential circuits have a combination of receptacles and lights connected; ideally you find a circuit with no lighting and as few receptacles as possible, cut the power at the load center, replace all the receptacles with 6-15R or 6-20R depending on wire gauge, then replace the circuit breaker with a double pole breaker and connect both conductors to the breaker and you're good to go.  If you want to comply with the National Electrical Code then I believe you need to put a piece of black or red electrical tape on the white (previously) neutral wire to indicate it being a hot.
*disclaimer: I'm not responsible if you electrocute yourself. ;)

I don't think the difference in efficiency between running a PSU at 120 vs 240 really warrants doing this unless you're running a lot of units though. (and in that case you may need to use 240v or run a new circuit to avoid overloading the existing circuit @ 120v)