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The API is very minimalistic (very easy to learn), and there is complete reference for it.
Pro Web search (horizontal and vertical) and using tools like Regular Expressions on results
Pagehop is bundled-up with recipes for Google, Bing and DuckDuckGo (horizontal) search, and with recipes for Wikipedia, StackOverflow, YouTube, jQuery API documentation, Mozilla Developer Network and others for vertical search.
After making a search you can further filter your results with tools - Regular Expressions, Fuzzy Matching or Search in the urls (instead of titles).
Pro Browsing of online documentation (any static web source)
Navigating through known set of hyperlinks without an actual rendered page, just by writing.
Pro Quickly navigate to web pages and their links
Pro Keyboard shortcut access to Hacker News
To be able to bring up todays news on a key shortcut, is absolutely awesome. Holding shift while pressing enter (choosing) on results, will keep the window open - this way you can open several pages you want to read through with your morning coffee.
Pro Unlimited, free, fully-functional evaluation
Like the SublimeText editor, Pagehop doesn't lock any features before you purchase a license and only displays (a tiny bit annoying) registration message.