There are some rumors going around concerning 2.01+ PSPs and people like Fanjita and Ditlew are being bombarded by emails asking them to do things that arn't possible. So here are a list of lies going around, so if you see anything on the list you now know it isn't true.
There is not a downgrader for 2.6, it hasn't been developed and kept in secret, it just doesn't exist.
2.7 has not yet provided us with an exploit that will lead to homebrew, let alone a downgrader.
I will add more to the list as time goes by, feel free to add some.