Flickrslidr
Want to add a slideshow to your site? Do it easily with the help of Flickrslidr.
Here's how it works: Input the link to a Flickr album you want to add to your site. From there, you can name it and input tags. Flickrslidr then spits out HTML code, allowing you to quickly and easily input the slideshow into your site.
Color Wizard
Color Wizard will help you determine which color works with your current color scheme or will help you to find compimentary colors to use with a given, known color.
When you get to Color Wizard's site, just input the color you want to match. From there, the service will spit out several colors that match well with your base color. If you're unhappy with all the colors on your site, you can also use the site's sliders to create a color you desire. It then gives you a color tag that you can place in your site's HTML. It's a simple, neat tool that I use quite often.
CSS Typeset
If you're looking to quickly edit portions of CSS from your site, CSS Typeset is one of my favorite tools to do just that.
The premise of CSS Typeset is simple: take some CSS from your site, modify it with the drop-down lists featured at the bottom of the page, and CSS Typeset generates the CSS code you can paste back into your site. You can change the font type, its color, alignment, and more. If you need a little help with CSS, CSS Typeset is the service for you.