Can I Merge Multiple Feeds Into A Single Feed?

Can I combine multiple feeds into a single feed? Essentially I want to mix feeds from a bunch of already existing rss feeds into a new rss feed that constantly update itself, by drawing up new entries from the source rss feeds?

Yes, you can use RSSmesh to merge multiple feeds into a single RSS feed that dynamically updates as new items are added to the RSS feeds that it draws from. Other tools that can be used to merge RSS feeds can be found at on RSS Tools.