LINQ

Innovation introduced in Visual Studio 2008 and .NET Framework version 3.5

Language-Integrated Query (LINQ) is a set of features that extends powerful query capabilities to the language syntax of C# and Visual Basic.

DLinq (also referred to as LINQ to SQL) is specifically the version of LINQ that focuses on querying data from relational data sources. XLinq (LINQ to XML) is that aspect of LINQ that is geared towards querying XML data.

In addition, the query functionality is not just restricted to SQL or XML data; you can apply LINQ to query any class as long as that class implements IEnumerable class.

WPF, XAML

Introduction to Windows Presentation Foundation - WPF (http://www.wpftutorial.net/WPFIntroduction.html)

WPF Layout (http://www.wpftutorial.net/LayoutProperties.html)

Introduction to XAML (http://www.wpftutorial.net/XAML.html)

What is wi-fi 802.11 b/g/n?

802.11n is the newest Wi-Fi that have a bandwidth of about 300Mbps (sometime it is more than that).

802.11g have a bandwidth of 54Mbps. For routers and hot spots, this is the most supported since it had been around for awhile already.

802.11b is the oldest with a bandwidth of 11Mbps.

I am not too sure but 802.11n might have better range then the others.

If you are thinking of buying an adapter, routers and laptop, I suggest you buy anything with 802.11n since it usually will also have support for 802.11g (and to a less extent 802.11b).