bratt wrote:how Google consider the links as our backlinks, is that quality rather than quantity.
Absolutely, it is not necessarily a problem to have many backlinks, but 100 links on a well related PR5 will probably have more impact on PageRank, and by far, than a thousand on not really related PR2 pages.
That's why many websites do have a PR over 5 with couple hundred Google backlinks, other do not cross 3 with several thousands.
It's not this obvious for SERPs, where links do seems to matter a bit more, even though there is still some moderation going on, since the amount of backlinks shown in the Google webmaster central (usually far greater than the link: command one) is usually quite lower than the one shown by yahoo.
As always, PageRank is not what maters the most, SERPs and referrals are