Changelog:

Updated to .NET 4.5 / Mono 3.x.x
Reimplemented how the CPU dynarec works:
Now generates an AST
Perform some generic optimizations and others related to lwl/lwr that weren´t possible before without the AST.
Adds a new window that allows you to see generated functions as C#, IL, XML or MIPS/disassembler.
Branch as local optimization
Native calling/jumping/tail calling with dynamic static fields
Optimized jalr in fors, caching repeated calls
syscalls rewritting to normal calls
direct memory access
VFPU completely reimplemented (now most of the instructions are implemented right)
Faster CSO decoding using the native DeflateStream from .NET 4.5
Huge Speedup related to GPU rendering:
Avoid to write video memory into RAM and then read to the display (now it copies the framebuffer into the display window without transferring data)
Support for scaling the render target (better quality of 3d games and games with bigger 2d textures)
Supports full screen (alt+enter)
Removed the requirement of wavoutput.dll and all that stuff, now it uses MaiAt3PlusDecoder
Added initial support for pmf/h264 videos. It is buggy and doesn´t play sound yet. But it is a beggining.
Much more accurate vsync
Lots and lots and zillions of major and minor improvements

Linux notes:
In order to run it in linux, you will need mono >= 3.0 with libgdiplus:

First you have to install a previous version of mono. For example in ubuntu:

apt-get install mono-complete

Then you have to build mono 3.0 and libgdiplus from source:

# libgdiplus 3
apt-get install libcairo-dev libpng12-dev libtiff-dev libgif-dev libjpeg-dev libglib2.0-dev
wget https://github.com/mono/libgdiplus/archive/master.tar.gz
mv master.tar.gz libgdiplus-3.0.tar.gz
tar xzf libgdiplus-3.0.tar.gz
cd libgdiplus-master
./autogen.sh && ./configure && make && sudo make install

# mono 3.2
wget http://download.mono-project.com/sources/mono/mono-3.2.0.tar.bz2
tar -xjf mono-3.2.0.tar.bz2
cd mono-3.2.0
./configure && make && sudo make install