A colleague and friend, Julie Cheung showed me some odd results in Yahoo’s site explorer this morning – The number of backlinks are shown to be very low for all sites (including the most popular ones out their such as apple.com)
For example:
This seems to be caused by the Merge with Bing and using Bing’s results. Performing the same query in Bing returns the same number of backlinks (188 in this case):
So if this remains thus, Open Site Explorer is you next best tool. However I presume Bing won’t leave it at this and will return true numbers in the coming months as to give users another use over Google.