An aggregator is an application that can read and organize a library of standard RSS feeds. Many of these applications are written solely for newsfeeds, though many of them also allow the ability to organize and play podcasts and video podcasts, as well as allowing you to syncronize podcast episodes with your MP3 player.

Use Podcast Fusion to search and find your favorite podcasts. Then copy those feeds to your aggregator by subscribing to synchronize the content to your playback device, or just keep a library of episodes on your own computer for offline playback at any time.

Below is a list of some of the more popular aggregators available:

Juice
Juice lets users download and synchronize Podcast feeds to their iPods, portable digital media players, or computers automatically. Juice has the ability to run as a taskbar application, transferring content aa it becomes available. Podcast Fusion can be set up as a Feed Manager for Juice, allowing bookmarked podcasts to be automatically synched through Juice to their Media Players.

RSS Radio
RSSRadio is an easy to use tool to download and listen to your favourite Podcasts.

Primetime Podcast Receiver
The Primetime Podcast Receiver will sleep silently in the background while you work, until awoken to do its job by your scheduling. It will allow you to manage your podcast subscriptions and schedule automatic scans for new podcasts.

NewzCrawler
NewzCrawler is a rss/atom reader, news aggregator, browser and blog client for Windows which provides access to news content from various sources, including Podcasts.

Juice
Juice lets users select and download shows and music and play whenever they want on their iPods, portable digital media players, or computers automatically. Podcast Fusion can br set up as a Feed Manager for Juice, allowing bookmarked podcasts to be automatically synched to Juice.

Newsfire
NewsFire makes it dead simple to get started listening to podcasts - the 21st century's pirate radio. Search, download and listen to podcasts directly within NewsFire using the innovative download player window or export them to iTunes for later listening.

Egress
Egress is a application which can display your favorite RSS feeds directly on your PocketPC, with the added capability of being able to download and cache enclosures for Podcast Support.

FeederReader
FeederReader is a full-featured RSS Aggregator with podcast listening and watching ("podcasting" or "podcatching") and enclosure support, running on Windows Mobile.