If you are interested in link exchanges with other blogs that deal with the similar topic to yours, you can check who already linked to your blog and return the favor. If you are hosted on Blogger this can be done through a widget obtained from wholinked.com. This widget was quite popular a year or two ago. There are many benefits of having this widget including increasing your popularity and encouraging other webmasters to link to your site. The widget does not display all of the sites linking to a particular site, rather just a few blogs. This was done on purpose to avoid unnecessary clutter. If you are interested in putting a similar widget on your blog, you can visit the site I mentioned or find other similar widgets.