What motivates people to link to other people? Listed are some of the reasons people might have for linking to you, and I am sure, some of the reasons you might link to other people.
RAP Bank
I have just signed up for RAP Bank myself - call this a mini-review.
It seems to be one of the smartest ideas for a long time as a great way to consolidate 100s of affiliate programs under a single entity for promotion.
It is also one of the best implementations of WordPress I have ever seen.
It is not without its bugs, as this is effectively pre-launch. For example I just found a bug in the keyword based search RSS feeds (yes RSS feeds for any term will be hot), but it looks like they might be onto a winner.
Check it out - signup for the basic service is free.
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P.S. It is not immediately obvious who is running the site, but looking at my Paypal receipt (yes I signed up for Vendor Plus) I believe the site is run by Bill Ortell From Rap-Extras.com who is RAP certified and does the membership add-on that is highly popular.
When reading other people’s blogs, you can encounter a multitude of linking problems that thousands of bloggers are making, either when linking to people within their own posts, or when they are commenting.
Wordpress SEO Masterclass For Competitive Niches

Having previously written that I don't typically undertake consulting work, I do look on any paid blog posts as a form of consultancy. In this particular case Tim from eMonetized decided to order a review of his blog, and we negotiated a little to ensure what you read is totally impartial and any links I choose to give are in an editorial context. The negotiation itself was an interesting process, and I will be writing about that separately. It should be noted that just because I mention improvements here, that doesn't mean that Tim the site owner isn't aware of something, and as also is almost always the case, I haven't applied many SEO tweaks to this site yet. That being said, some of the linking structures I talk about in the more geeky sections of this article I have never seen anyone talk about, and it is my belief that the resulting linking structure is highly unique, extremely powerful, whilst remaining flexible.