I recently J/B my 3G after upgrading to IOS4. Now it seems its a 50/ 50 chance that apps I used before are compatible? One in particular(Infinidock/ $.99/Cydia) I purchased(no trial available). After loging in and being redirected to pay for the app, I get back to the "install" page and get an error message stating to the effect this apps only works with ">4.0" Though it was only $.99 I think this should have been caught before I paid for the app... And of course I've never seen/ heard of getting a "refund" from Cydia?