We come accross various websites/interesting links in navigating through the web and there are now more than one way to bookmark them. There are also websites where there is always some activity like "tech" tag on Del.icio.us or "Software" on Yahoo answers. Now, here are couple of ways to add these interesting/dynamic content links to your blogs/websites. The basic idea here is to expose interesting RSS feeds to your visitors.
Google Reader & Yahoo Answers:
Google Reader's - "Share" feature allows you to publicize any labeled item in your blog. For example, Yahoo Answers provides feeds for its Questions catagorized by Topics allowing you to subscribe for feed in the topic. Now, if you subscribe for the Yahoo Answers feed in your Google Reader you can provide links to questions in the sidebar like this:
Web 2.0 style Ticker: Reddit/Del.icio.us/Digg/Other feeds + AJAX
There is another way to provide similar feature using an AJAX style and combining the power of feeds from social bookmarking sites. For example, Reddit provides RSS feeds on submitted links:
The "?t=week" signifies link(s) posted within the last week.
Each of these services Digg/Del.icio.us also provide similar feeds. Del.icio.us also provides feeds for each of your specific tags, so you can select some specific tag that you want to expose and combine with Google Reader or use an AJAX library to display the feed. You can download an AJAX library for RSS Ticker from Dynamic Drive. In their rssticker.js just uncomment, "lastrssbridgeurl" variable to point to the RSS feed that you want to expose and use demo.html as an sample.