GlassDoor – Compare Your Salary Against Others

GlassDoor lets you anonymously share your salary figure with others and in return, get full access to salaries of others. Simply post an anonymous salary of your own and in few minutes you will have access to salary figures in over 23,000 companies shared by real employees. This is one of the sites that you should definitely check before going for your next job interview.

Rentometer – Compare Rent Rates

On Rentometer, you can find out whether the amount you’re currently paying for your rent is a rip-off or a bargain. Rentomoeter compares the amount you pay to an average rate for similar apartments in the neighborhood. There is also a map view of nearby apartments including their rates.

PriceGrabber – Compare Product Prices

PriceGrabber is one of the most popular price comparison sites in USA. Search for the product you want to buy and PriceGrabber will find all retailers selling the product and list them starting from the cheapest. The results can be also sorted by user ratings and reviews.

For Canadian residents:
RedFlagDeals - Community Based Forum
SmartCanucks - Community Based Forum
PriceGrabber
PriceCanada
ShopBot

CompareMyFiles – Compare Text Files

CompareMyFiles is a simple online tool that lets you easily compare two text files online side by side. Very useful when you have slightly different versions of the same file and need to find the exact lines where they differ.

Compare Dimensions: Sizeasy / DisplayWars / TV Calculator

Sizeasy, DisplayWars and TV Calculator are 3 excellent sites that can help you a great deal when you are trying to visualize the dimensions for things like small electronic gadgets, mobile phone and TV screens.
I have used these tools countless times and highly recommend them to everyone. Sizeasy works great for smaller items like mobile phones. The other two focuses on TV screens and monitors.

GasBuddy – Compare Gas Prices

GasBuddy is a great money saver site for those who drive a lot. On this site, you can quickly check gas prices in your area and find the cheapest gas prices and stations. Just type in your zip code and you’ll get a list of gas pumps along with the gas price at each of them.

When it comes to gas prices, I highly recommend you check out PetroFix. This site allows you to hedge against future gas price increases and make sure you never overpay for gas.

CarRentals.com – Compare Car Rental Rates

CarRentals.com is the biggest car rentals aggregator site that makes comparing car rental rates really easy. It searches for offers from different vendors and gives you a list of available cars sorted by the daily rental rates starting from the cheapest.

By default, results are sorted by price. However, you can also sort them by vendor, distance from your house, car type and vendor location.

Test your site's load time with Webslug

There are a lot of ways to measure how quickly your site loads, but most of them aren't going to be reflective of how your users perceive your load time. Webslug is a tool that attempts to give you a read on the load time from request to fully-loaded. You can put in one URL or compare two URLs in a head-to-head battle.

It's nice to see a web-based tool to measure this stuff, no downloads required. I'm not sure how useful Webslug's data is, compared to the data you might get from other testing methods. There are aggregated numbers for different browsers and OS's, but those leaderboards might not mean much on their own. If you test Webslug, let us know whether you find it useful in the comments.