I recently submitted one of my sites to the search engines with a few keywords that I didn't realise were so "unusal" to the the engines, that they would get me the first listing under that keyword. It was only about 4 days before I checked a few of the keywords and funnily enough, those that were the "unusal" ones were coming up as #1 listing, and had been indexed very fast. I tried another keyword, one that already has been submitted by others, and the site is not showing up with this keyword yet.

Are the words that are not already on the engines index indexed first, as they are unique, and will it start showing up results for my more popular keyword later, as it still has to sort this into the index for that word?