1) System Requirements
You need either the Mono Framework or MS .NET framework installed. Runtime memory usage is typically under 10 megabytes of ram for the library alone. More memory will be required if you use a fancy GUI, but that depends on the GUI you use.

You will also require the GTK Sharp libraries to be installed if you are using the sample GUI. If you are using Mono, then this is already included in the Mono installer. If you want to use the MS.NET framework, you will need to get the GTK# installer from the downloads page.

2) Supported Platforms
Windows 98 and above using the MS.NET Framework.
Or Windows 2000 and above, MacOS X 10.3 and above, Linux (most flavours, if not all), Sun Solaris and BSD (OpenBSD, FreeBSD, NetBSD) using the Mono Framework

3) Licensing
MonoTorrent is licensed under the MIT/X11 license, i.e. completely free and open.

4) What language is MonoTorrent coded in?
MonoTorrent is coded in the C#

5) But aren't managed languages really inefficient and slow?
Surprisingly enough (and this answer may astound you), no. It is true that for some applications the use of a managed language will slow things down but that is typically in the scientific area or number crunching field. A .NET based program is compiled to an intermediate language known as bytecode when it is compiled initially. When you run a .NET application, or access a .NET library, the first thing that happens is that this bytecode is processed, optimised and compiled to native code. This means that what actually runs on your system is native code, not interpreted code, so it runs a lot faster than an interpreted language like python.

6) Installation
Just unzip the package into your directory of choice and run. If you want to remove MonoTorrent, just delete the folder you extracted it to. There are no files or settings placed anywhere else.

7) Does MonoTorrent have feature XXX
Well, if you can't find it, then probably not. However i do recommend that you either send me an email and ask, or try implement it yourself and submit a patch. Method B is likely to be faster but please do contact me if you plan on implementing a new feature.