You can configure highlighting settings in the standard VS.NET highlighting setup.

Highlights variables that are never used. This is very handy when working on "group" code when you're not sure if removing a variable will blow anything up.  Cleaner code.

Bracket Matching: You notice that the brackets for the foreach block are highlighted. That happens for each code block whether it's a foreach loop or an if statement. This is helpful for nested parentheses too since it can get confusing at times.  As you move to a parenthesis its matching parenthesis is highlighted. Also in this screenie is a an example where the beginning of the foreach loop is outside of the code window. The cool little tool tip pops up...I like that!

Code Refactoring:

Renaming:

Using the ReSharper rename will automatically correct all references to that item in the code. It's not just a text match.

If you rename a Namespace all Namespaces, Using directives, and qualified names of types are renamed. If you rename a Type all Using directives, and qualified names of types are renamed. If you rename a Method all calls to the method and overridings/implementations of the method in subclasses are renamed.  There have been times where I've not renamed a method because I didn't want to track down all of the uses and possibly miss one.  If you rename a field all uses of the field (both read and write) are renamed.

Encapsulate Field:
If you've ever spent time creating a class that has more than a few properties you know who much of a beating it can be just to type everything. Here, you type the field and then right-click& bam!  Less time typing getters and setters.  Or if you choose convert your current properties to a pair of Get/Set methods.

Convert Property to Method:

Code Analysis bar (not official name but what I call it). It's a handy vertical bar on the right-hand side of the code window. At the top it's green if good, orange if there are warnings, and red if there are errors. What dictates a warning/error is configurable too. As you move down the vertical bar there is a smaller indicator where the warning or/error is. Hover over it and it gives you the message.  Less time attempting to compile/recompile.

Auto complete: This another favorite of mine. A simple Alt-Enter puts the needed using statement for me at the top of the code. The second screenie shows where I just typed in "Sql" and pressed ctl-alt-space and it gave me a full list...notice that the System.Data.SqlClient using statement is not at the top, yet I can still select that class. No more searching for the right namespace if I know the beginning of the class name. When I select the class it will insert the using statement too.

Code Reformatting:

I'll be honest, this good enough for me to almost spend the $150 of my own money (may have to anyway). In the ReSharper options I can design my own coding style standards and with a simple right-click ReSharper will reformat my code (highlighted section, class file, or complete project) to the settings I picked. I've heard that  a good use could be where a company can come up with their own coding style/standards and each developer and still code how it works for them. When the code is ready for check-in just reformat the code to the company settings. Either way I like having it look over my shoulder for me to keep up a personal standard. Saves me time in not having to re-review my own code for the standards and provides cleaner code.

There is really only one thing that I currently don't like about ReSharper.  The loading of a project is slower since Resharper examines all of the files and assemblies during the load process.  It's not too bad after the first go but it still bothers me enough to mention it.