Speed Dial works (with the default setup) by placing 9 clickable thumbnails on your blank tabs, which are usually the ones you just opened to start browsing a new page, so it is a perfect place. The thumbnails are 100% set by you and there are no defaults that lead you to ad pages or anything like that. (See Speed Dial Main image)
So, you put your 9 most visited sites on the page and now you have a way to access them faster than bookmarks and without remembering hot keys or short names. Now, you are thinking, that is pretty cool, but it won't boost my productivity. Touchee.
Where the productivity boost comes in is with the multiple tabs available inside of Speed Dial. (See Speed Dial Tabs Image) As you can see from my screenshot I have tabs for my Main sites, as well as my Deal (finding good deals on stuff) websites, as well as my professional sites, my blogs, sites I use for my personal family life, sites for marketing, and sites for finding new freelance jobs. The work-it tab is where I put things that I want to keep working on, but don't really have a permanent home for yet. Things like building profiles or signing up for networking directories, and so on.
Now, based on each part of my day I have my sites right at my finger tips. I start each day by searching for new opportunities for my freelance writing business. My 9 best job hunt sites are right there ready to go. (Actually those are sites 2-11, my best two are on Main). But, when I'm done with that part of my day, I don't have to worry about all these sites popping back up just to get closed down. Instead, when it is time to do some marketing from my home office, I click the Marketing tab and I'm off to my best 9 marketing sites.
You can customize Speed Dial to do more or less for you including smaller thumbnails and setting it up to be less intrusive if you want to activate it manually (but why?).
Adding sites is as easy as right-clicking the tab of the open page that you want to add and choosing Add to Speed Dial. You choose the tab and position number in seconds, and next time you open that tab, your site will be there. It is perfect for making sure that you don't forget about new resources for your home office business.