Changed keywords, website crawled but no results when searching the new keywords

[paokun]

hi everyone,
this is my first post, this is a really great website and i check very often tips about SEO.
now i have a problem, so i've registered and i hope someone can help me out.

well,
today it's may 22nd and my homepage's cache was just updated in google, but it's written the cache image was taken on may 18th. why even if it was cached on 18th the updated version appeared on google just today?

and another thing. on may 15th i've changed my website's keywords. the page was crawled by googlebot after that, but when i try searching for those keywords, my website doesnt appear within the results.

i've chosen very high KEI keywords, and for some of them my website should be the only result to appear in a search, but when i search for it my website still doesnt appear.

i dont think there are mistakes in the keywords, i've written them like
<META name="keywords" content="blablabla">
and i dont think i'm mistaking something.

well it's as if google doesnt care my meta tag, perhaps i should include the keywords in the homepage text, but if so dont i risk to be considered as if i'm spamming? in the meta tag i already have about 15-20 keyphrases.
moreover if i add them in the text of the homepage i dont want them to be visible because the main page has just a welcome image, so if i make them 1px size and white on a white background it would look even more like spamming.

any advice? i hope someone can help me out, with the new keywords i should increase my new visitors from an average of 30 to an average of 400-500 everyday..so i'm really looking forward to have my website listed properly.

thank you very much, i hope i can be part of this great community :)

[paokun]

i've just thought of this:

writing the keywords in the homepage text, 1px size almost invisible is considered a way of spamming.
how about making a rich-html tooltip, with bold text and big size fonts, that appears just if the user moves his mouse over a single pixel of the page?
will this be better? it will be invisible as well and no one would move the mouse over this pixel.

well anyway, just a thought, i'll keep waiting for your opinions, thanks :)

[webkidsan]

Getting your site cached or indexed doesent have to do any thgn with ranking ... and putting keywords in the tags is not going to make a difference either ... and your comment#2 - if you are tryign to trick the search engine - dont do it - You got to do more than just adding keywords in the meta tags -