PATH environment variable

Command prompt:

set PATH=%PATH%;c:\newdir

Appends a new path to the PATH variable. However this is scoped to the running CMD window. To make it a permanent change there is a utility called setx.exe (details here)

Microsoft Log Parser

This is a tool that provides query access to text-based data such as log files, XML/CVS files, as well as Event Log, the Registry, the file system and Active Directory.
Download here.
Here is a sample query that returns the top bandwidth by URL

SELECT top 50 DISTINCT 
SUBSTR(TO_LOWERCASE(cs-uri-stem), 0, 55) AS Url, 
Count(*) AS Hits, 
AVG(sc-bytes) AS AvgBytes, 
SUM(sc-bytes) as ServedBytes 
FROM {filename} 
GROUP BY Url 
HAVING Hits >= 20 
ORDER BY ServedBytes DESC

So at the command line run:
logparser -i:iiswc3 "SELECT STATEMENT GOES HERE"

Here are some links to example queries:
LogParserPlus Queries
ServerFault IIS Queries
Tutorial
IIS Forum

Net command in CMD

Useful when you want to find out where the SHARES are located on a computer:

C:\net share

Returns a list of Share Names <--> Resource (local paths)

Notice that shares ending with $ are admin shares

SQL Server Email

EXEC msdb.dbo.sp_send_dbmail
@recipients= @Recipients,
@body= @temp,
@subject = 'Test',
@profile_name = 'DBMailProfile'

See this Example

C# BubbleSort routine

So I wrote the first version (not optimized) in 5 minutes. For the optimization it took another 5 minutes.
This algorithm is O(n2) and as Knuth puts it, "...bubble sort seems to have nothing to recommend it, except a catchy name".

/// <summary>
/// Optimized version of BubbleSort that parses one less item each iteration
/// </summary>
public static class BubbleSort
{
    public static int[] Sort(int[] input)
    {
        int temp, count = input.Length - 1;

        while (count > 0)
        {
            for (int i = 0; i < count; i++)
            {
                if (input[i] > input[i + 1])
                {
                    temp = input[i + 1];
                    input[i + 1] = input[i];
                    input[i] = temp;
                }
            }
            count--;
        }
        return input;
    }
}

There is also this interesting BubbleSort question on stackoverflow