"is it me, or..." meaning and usage

What does "is it me, or..." mean?

Examples:

• Perhaps it is just me, but I find Intel's ultrabook pitch somewhat confusing.
• Is it me, or is this a bug?

Solution 1:

Is it me = is it my mistake/fault.

"Is it me, or is this a bug?" - Is this my fault for not understanding something or is it a bug.

The implication is normally that you don't really think it is your mistake so it's phrased as a faked apology. ie I might be mistaken but I don't really believe I am.

It can also be used to make an insult/comment, "Is it me or should she really not be wearing that at her age?", assumes those you are talking to agree with you.