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If you have money or know people that could link to you, I assume you wouldn't be asking here.
Also, check out this link for some good reading:
[webmasterworld.com...]
Link building is the key. Not only for achieving a good PR but also to stay in the top of the SERPS. Lately google has been very catious about where your links are coming from and whom are you linking. Try to get as much information as you can before you eventually start accumlating or exchanging links.A few bad neighbourhood linking may lead to the penalization of the site. The purpose is not to scare you but to make you realize that Link building is indeed the most important part of an SEO endevour for Google. Check out the forum for more details..
[webmasterworld.com...]
The way to increase your PR is to acquire incoming links from as many and varied sources as possible. PR6 is pretty respectable to begin with so I wouldn't go desperately exchanging links with every half-baked links site etc. Look for good quality relevant sites in your subject area and send a few friendly emails.