I've been keeping a running collection of tips/tricks that I felt made my life easier as a developer.  I hope this collection has you feeling the same way.  Feel free to post a comment at the bottom if there are others you found useful as well.

1.  Visual Studio.  Conditional breakpoints.  Have you ever right clicked a breakpoint when developing in visual studio?  If you have then you would know there are a slew of break options.  You can break when a certain 'Condition' is met (i.e. x = 5), when a certain hit count is reached (i.e. after 5 hits).  This should speed up your debugging.

2.  Visual Studio.  If you want to comment or un-comment an entire block of code inside visual studio.  Highlight the block of code and select <Ctrl>+<K> and then <Ctrl>+<C> ... if you wish to un-comment a block, then use <Ctrl>+<K> and then <Ctrl>+U.  This works in both Visual Studio as well as SQL Management Studio.

3.  Visual Source Safe. When in Visual Source Safe you may use the keyboard shortcut <Ctrl>+<S> to see all files currently checked out, globally, or to a specific user.  Additionally you can search within only the current project, or the entire VSS database.

4.  Visual Studio. If you want to see a history of all edits to your file when you are in Visual Studio, you may right click the file in Solution Explorer and select "View History".

5.  Javascript.  When including a script file on a site with an SSL certificate, use the html markup <script src=”//www.company.com/scripts/file.js”> approach for preventing the security ('This page contains secure and non-secure items) dialog pop-up.  Notice that the http: portion is gone, but it will render properly regardless of the current protocol.

6.  Javascript.  In addition to #3, if you would like to obtain the current protocol which is in use in your Javascript, you may obtain that by issuing the following command:

var prefix = window.parent.document.location.protocol + '//';

7.  Javascript.  If you wish to get the object which caused the asynchronous postback on an asp.net ajax enabled page.  You may use the following code:

var ClientId; 
var prm = Sys.WebForms.PageRequestManager.getInstance(); 
prm.add_InitializeRequest(InitHandler); 

function InitHandler(sender, args) { 
  ClientId = args.get_postBackElement().id; 
  alert(ClientId); 
}

8.  SQL.  If you need to remove a set of duplicate records, try using the following statements.

SELECT MyDuplicateColumn, MyDuplicateColumn2, Count(*) - 1 As NumToDelete FROM MyTableWithDuplicates GROUP BY MyDuplicateColumn, MyDuplicateColumn2 HAVING COUNT(*) > 1 

Then while looping through the records in the above recordset, issue the following command:

DELETE TOP (NumToDelete) FROM MyTableWithDuplicates WHERE MyDuplicateColumn = 'MyDupeValueFromPreviousQuery' AND MyDuplicateColumn2 = 'MyDupeValueFromPrevousQuery2'