Link Harvester is a free link analysis tool that returns:

• unique linking domains
• their IP addresses & unique c block addresses of the links
• links from .gov, .mil, .edu, or .ac.uk domains. Links from these domains are likely rated better in authority type algorithms such as Hilltop or TrustRank.
• Link Harvester also bolds and autochecks domains that link from 5 or more pages. You can then requery the Yahoo! database and spider deeper than the 1,000 link limit.
• Link Harvester uses the Yahoo! API, provides CSV outputs, and is an open source tool. If you are a heavy user or the query limit (5,000 daily requests) is exceeded feel free to host your own copy of Link Harvester on your site. Setup should take under a minute.
• Here is the source code. Please note, your host must support DOM XML to host this tool.
• Link Harvester also links to the Internet Archives, WhoIs Source, and Google cache near each link.
• Questions, comments, feedback? Let me know what you think.
• 403 errors means the tool is used up for the day.