People of EU may already have the new KD-4 update .Samsung released a Froyo update for 551 in last week April.
The KD4 firmware is less buggy .It has Froyo 2.2.1 .Touchscreen lag seems to be fixed .Applications are launched a bit quicker.Nothing radical but still an update.Random freezes are fixed and problems with gmail app are supposed to be fixed.
Edit : It is the KD4 update ,sorry for the error
Edit 2 : Odin and flashing firmware is not for the weak.It seriously voids the technical warranty.Your phone can brick .You can become strong though
Edit 3 :It never bricked for me and I hate KIES and jokers known as Samsung support
Edit 4: Once in a while if the CSC doesnt back up ,you will be stuck to free apps only android market.In that case I dont have any Solution as of now except to be a supreme cheapskate.
EDIT 5 : This method may not work for the I5510L ,I5510M,I5510T ,I5510 BR versions.
The KD4 firmware is less buggy .It has Froyo 2.2.1 .Touchscreen lag seems to be fixed .Applications are launched a bit quicker.Nothing radical but still an update.Random freezes are fixed and problems with gmail app are supposed to be fixed.
Edit : It is the KD4 update ,sorry for the error
Edit 2 : Odin and flashing firmware is not for the weak.It seriously voids the technical warranty.Your phone can brick .You can become strong though

Edit 3 :It never bricked for me and I hate KIES and jokers known as Samsung support
Edit 4: Once in a while if the CSC doesnt back up ,you will be stuck to free apps only android market.In that case I dont have any Solution as of now except to be a supreme cheapskate.
EDIT 5 : This method may not work for the I5510L ,I5510M,I5510T ,I5510 BR versions.