Hi there
While it is quite anachievement to get to # 1 on googles frontpage, the keyword term used would be relative to how much of an achievement this is.
There are cetain terms
SEO for a website will never move from googles frontpage such as "accounting software" "car parts" "car manufacturer" "computers"
In the general categories hitting # 1 will be virtually impossible. Google gives websites length of time online crediting. So an accounting software firm like Peachtree Accounting will never fall from the # 1 spot short of severe scandal or security exploitation.
Great job none the less and I hope it is helping you convert those surfers to sales.
Also research has found that the # 1 position on googles frontpage is not as valueable as # 2 and # 3.
People believe the # 1 position is a sponsored listing and so they dont click it. This is also seen in PPC campaigns where # 1 on the top right does not fare as well as # 2 in drawing traffic.
Clint