Bond traders working for banks have immensely sophisticated information resources made available to them. They need real time information and they need to be able to access very specific information on each bond they look at. It's not surprising that this information costs money - and since there's a lot of it, it's not easy to find your way around.
For the individual investor who simply wants to keep track of what's going on in US Treasury Bonds, for instance, CNN provides bond market news on its CNN Money web site.
CNN's bond market coverage doesn't go into great depth, but it is relevant and timely. The CNN Bond Market Center reports economic and bond market news and prices. It also has a home page featuring useful graphical displays such as the yield curve chart, prices of 2, 5, 10 and 30 year maturities of treasury bonds, and their yields, as well as the price and yield change on the day.
CNN Bond Market Center also contains basic educational material such as 'Bonds 1010' and 'Yield curve 101' for novice bond investors. More experienced investors will be interested in articles which cover investment advice on such topics as how to build a bond portfolio, together with coverage of bond funds for those who can't afford to build up a diversified portfolio of their own.
Unlike most local news services, CNN is large enough to be able to employ specialized financial market reporters. These journalists have access to sources of information and comment including bond fund managers, bond market analysts, economists, and bond traders. CNN's Money Magazine also publishes comment on the bond market and bond funds, with the big advantage that it is relevant to the individual investor rather than being written for big banks' bond traders.
If you are getting seriously into bonds, or day trading, then you may want to consider more specialized resources. (Some brokers provide excellent electronic resources for their clients, either free or at subsidized prices.) But for the average personal investor, CNN Money offers a useful information service giving up to date information at reasonable depth.