If you are looking for an application launcher for your Mac, Alfred can be a great option for you. Though Alfred is still not as good as QSB or Quicksilver, it has all the potential to become a competitor to these 2 in future.
You have to hit the keystroke combination (By default, it is Option+Spacebar) and then type the application name that you will like to open. The default keystroke combination can easily be changed from Preferences menu. After the search results are displayed, you can open the applications with a keystroke combination as well. If it’s the first result, hit Return. If it’s something else, hit Command+Specified Number (The number at which the application is displayed in search results). You can use the arrow keys to navigate through the search results as well.
If you need word definitions quickly, you can use Alfred for that purpose. Suppose, you want to know the meaning of word “Butter”, then you have to search with “define Butter” (Without the quotes) and search results will be displayed. Now, similarly like app results, you can browse through the definitions.
You have to activate it from the Experimental Tab of your application. Then in the search box, type the expression whose value you want to find out. Suppose, you want to find the value of 20+5. Then in the search box type = (20+5) and it will present you the answer 25. Alfred is for simple calculation only though.
You can set the websites to access from the Preferences->Web menu. You can also set customized searches of specific sites through Alfred, if you wish.
Alfred is easy to work on. However, it’s still cannot be your first choice as a Mac application launcher. The developers are definitely planning on improvements and if you have something to share about Alfred, please use the comment feature.