Shrugged -- I agree with the advice about laying your cards on the table and having a heart-to-heart talk with your boss. You owe him/her that much. But I would think twice about making a jump so quickly. It says something about you to future employers about your loyalty and integrity. Not to say that there can't be good reasons for such a premature jump, but it should really be an incredible, rare opportunity to make you do it. Don't do it just for more money.
One thing to avoid is creating a trend of jumping ship on your CV. If you've stayed at one company for 5 yrs+, and then stayed a very short time at the next company, then you can be forgiven for burning one bridge. You can explain that to a future employer and it likely won't be held against you. But if you've had many successive short jobs, it shows that you can't make up your mind, have little loyalty, and are always looking for the next great offer. Who wants to hire someone like that?
FD
One thing to avoid is creating a trend of jumping ship on your CV. If you've stayed at one company for 5 yrs+, and then stayed a very short time at the next company, then you can be forgiven for burning one bridge. You can explain that to a future employer and it likely won't be held against you. But if you've had many successive short jobs, it shows that you can't make up your mind, have little loyalty, and are always looking for the next great offer. Who wants to hire someone like that?
FD