"Tell yourself at every step in the design process that someone has undoubtedly already thought of this and what can you do to really set it apart. In design, and particularly logo design, the pessimistic axiom that “everything has already been done” is becoming more and more true, and it is only the virtuous designer who can continue to stand out in a sea of sameness. Mike Davidson"
Some really shocking similarities in a lot of those logos. Most of them I think I'll give the benefit of the doubt, the Blackburn Market, and Barrow logos for example are both pretty unoriginal (they've been selling these I<3 Blackburn T-shirts in the tourist info office for a few years now).
You've reminded me of this page on the Panic website Damon. They basically name and shame everyone who's ripped off their iconic Transit Van logo, it's classic.