Small businesses can view web logs to provide information on how many times a specific file (RSS feed) is requested. The logs and information is rudimentary but will give a basic sense of a feeds success. Many 3rd party tracking options have additional tracking information available.
The most common method to track the number of feed accesses or individuals accessing a feed is to use a 3rd party feed host. Companies like FeedBurner essentially track feeds based on accesses. The downside to using a 3rd party like Feedburner, is that the url is a FeedBurner url and any PageRank or popularity associated with the url will benefit the feed host rather than the feed creator. Additionally, no distinction is made between unique views or syndicate feeds.
FeedBurner provides a free no frills service to host RSS feeds and they have been proactive in circumventing user concerns. Recently implementing a service that eases users concerns about migrating from FeedBurner. There is a 3 step process for users interested in migrating from FeedBurner's free service, implementing a permanent redirect, and url forwarding.
Details can be found at: http://www.burningdoorc.om/feedburner/archives/001251.html
Some publishers, who were concerned about lock-in or wanted to retain control of the domain and feed urls often resist a hosting service. The new program FeedBurner Partner Pro is not free, but allows for users to point to their own domain, retaining complete control of their feeds without sacrificing statistical tracking.
The downside to using a service like FeedBurner is that some filtering applications used on corporate proxy servers block feeds residing on FeedBurner or other free hosts.
Companies like SyndicateIQ have more complex tracking solutions that generate unique urls for each subscriber. The tracking benefits to such a customized solution is obvious. Individual user habits can be monitored and any users abusing their access and inappropriately syndicating a feeds content can have their feed turned off. The downside of course is that the success of RSS is in a large part due to the anonymity. Users don't want their personal habits tracked.
Uniquely Named Transparent Images
Uniquely named transparent 1x1 graphics can be added to the description field of an RSS feed. Users can use standard web logs to see the number of times the image is viewed and determine the number of times the feed was accessed.
Companies Specializing in Tracking and RSS Metrics
Pheedo - Pheedo creates tools that enable individuals, organizations and corporations to promote, analyze, and optimize their weblogs and content.
SyndicateIQ - SyndicateIQ's position in the content distribution chain provides clients a set of analytics.
FeedBurner - FeedBurner offers a full range of services to help you build awareness, track circulation, and implement revenue-generating programs in your feed(s).
Each individual using RSS needs to make a decision of the extent and importance of the analytics they require. Realizing that any system they employ is not going to be perfect.