The Google Webmaster Tools "external links" report is buggy over the weekend. The tool is not showing any backlinks anymore for, I believe, any site.
For example, here are the non-existent backlinks for the Search Engine Roundtable:
There are dozens of reports from webmasters worrying if Google banned them or not. Threads at DigitalPoint Forums and Google Groups both have concerned webmasters discussion the issue.
The issue started Sunday morning or early afternoon and is still an issue at the time I write this. Hopefully it will be fixed shortly.
Forum discussion at DigitalPoint Forums and Google Groups.
Now Fixed: At about 3pm (EST), it has now been fixed. JohnMu, a Google Webmaster Trends Analysts posted below and I confirmed it is now fixed.
