I've just upgraded my iPhone 4 to iOS 5.0.1 and also jailbroken it. I've waited with the upgrade until the jailbreak because there are some tweaks I don't want to miss. Now that I have iOS5 jailbroken, I want to re-add those tweaks, but I don't find them in Cydia.
Looking at the sources in Cydia, I see that Modmyi.com and Cydia/Telesphoreo are listed and they do contain lots of items, but Big Boss and Dev Team and cydia.zodttd.com are also listed, but when I select each then there's nothing in there.
So it would appear that some of the repo's are not properly set up. To test this, I removed Big Boss and hit the "Add" button to add it again, but got an error message "Did not find repository".
Best Answer
Aha, it turns out that the sources have moved. They're no longer located as specified in Cydia, so of course Cydia can't find any content.
The solution was to remove the faulty sources and add them again by following these instructions: http://www.appleiphoneschool.com/how-to-add-a-source-to-cydia/