Welcome to the Q&A Forum

Rand also offers some encouragement on this thread over at http://www.seomoz.org/q/iffy-question. Stick with the quality content creation and doesn't chase after the types of links you talk about in your question.

Linkscape, the data source for Open Site Explorer, was just updated on November 2nd. It is normally updated once/month but the SEOmoz team is working to enhance the process which can affect the update timeline. The crawler sees the top 25% of webpages. It does not crawl 100% of the internet. For the most part, if the SEOmoz crawler does not see the link, it does not have much (if any) value. If you built the links prior to November, then they should be visible in the next update. Bookmarking can be very valuable if the bookmark is used and visible. For example, if you get your bookmark to the front page of a site and it is promoted in any way. If you simply add a bookmark which is otherwise not used and located on a buried page, it likely has no value. A Press Release which is offered by PRWeb or other reputable companies and is picked up has value. Some press releases are simply not seen or valued. If you can earn links from quality, reputable sites then those links will be quickly found by Linkscape, and even faster by Google. Links from a site's home page, or links from a strongly reputable site from a popular web page are helpful. One strong link is often worth more then 100 random links. Go for quality.