SearchWeb very convenient iPhone app that allows you to create some keyword searches based upon the firefox "add a keyword search" type string. Then the app will allow you to enter the search string, and it loads safari with the search page.
Let's cover how you might perform a search without this app. Let's say we want to search for "Final Fantasy XII" in gamestop's site. You would load safari, then type in "www.gamestop.com" and wait. If you're on EDGE, you'll wait a while for gamestop's page to load. When that's done, you can now type "Final Fantasy XII" into the search box. On most pages you'll have to zoom to the search box first because the text is small - so it takes a bit. After this, you now have to wait all over again for your search to load.
With this app, you tap the SearchWeb button, tap "gamestop" and enter "Final Fantasy XII". Safari is loaded and the search page is the first thing that is displayed. You only wait once, and you also have much less typing.
The app comes preloaded with several common search engines but you can add/remove/resort on your own using the built in GUI. To add more URLs, just click edit, add, and follow instructions. There is an included help that will walk you through adding your own searches with pictures.