Running out of link building ideas? Here are a short list of sites where you can submit your link without any hassle. Note though that you should NOT resort to spamming these sites. Always submit a link only when it is relevant and do not do so excessively.

Digg - Who hasn’t submitted something to Digg? If you haven’t it might be time for you to submit a really good blog entry of yours. If you have no blog you can submit a link to the most recent article about your website.
Yahoo! Answers - Answer questions where you can site your blog/site as resource. Make sure your link really is relevant to the answer. With so many questions in Yahoo! answers you it shouldn’t be hard to find a question that would serve your purpose.
Forums - Join a a good forum about your niche and be active there. DO NOT link drop but use your website URL as part of your signature if allowed. At the very least you can put it in your profile page.
Craigslist - Post an ad at Craigslist. You can post a new ad each time you have a new product/service you want to promote. Free advertising and free inbound link. What more can you ask for?