I thought you know about wordtracker, cause you know about
seo.
Use wordtracker to get all keyword that people are searching in search engine that related to your site. Don't target one keyword only. Target all keyword that related to your site and optimized it. Let say your site about wallpaper you can find related keyword in wordtracker about wallpaper. Here are the list I got from wordtracker.
wallpaper 14,624.0/day
free wallpaper 5,083.0 /day
wallpapers 5,053.0 /day
computer wallpaper 4,371.0 /day
desktop wallpaper 4,081.0 /day
free desktop wallpaper 4,077.0 /day
sexy wallpaper 1,908.0 /day
anime wallpaper 1,823.0 /day
cool wallpapers 1,506.0 /day
star wars wallpaper 1,476.0 /day
3d wallpaper 1,409.0 /day
anime wallpapers 1,406.0 /day
free wallpapers 1,293.0 /day
sexy wallpapers 1,253.0 /day
wallpaper borders 1,068.0 /day
You see, instead of targetting for "vista wallpaper", you can optimized for "free wallpaper" or "computer wallpaper" that got search more than 4000 searching per day. If your optimized for it and get top ranking, your traffic will boost more than 1000 unique visitors per day.
Keyword research is important. Wrong keyword, your site is doom...