My site seems to look nicely when all 3 Adsense ads boxes are shown up, but when some are missing (not available ads ?), there are big blank spaces and looking is very bad. Should I fill it with images or try to fill pages with more relevant keywords? Thanks for your input. Tuan.
Definitely ad your own ads that enhances branding on your site. Maybe an ad encouraging site visitors to refer your page to their friends.
heh, actually your site looks spammy when all your ads appear. Anyway, you should alt text your images, it helps a little.
May be Nystul is right, some pages with less content looks like spammy. I should add more content soon. Thanks all for input.