Link Harvester 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.