I like the ajax loading. Internet marketing types will like the ability to see the first X pages all on one page without having to set some parameter (as in google)
Yes, the ajax loading is much less intrusive than loading a new page. It makes it far easier to search through the existing results. It needs one or two UI changes:
1) When you click 'more results' add a divider before the first new result to make it clear which new results just appeared. In most cases the first new link will already be highlighted since the mouse will be hovering overy it but any antsy mouser will not have this benefit.
Also, I notice that I have the tendency (and need) to move the mouse off the first new link so I can read it. This is very inefficient so it would best to append the new results one line below the 'more links' link.
2) Consider adding an auto-scroll to put the first new result at the top or middle of the page to reduce scrolling. This may be disruptive, however.
