A few things to consider relevant to this discussion:
1. For those whose position is based on science, and the brain just being neurons triggering, and our body and its functionality just being the result of chemical reactions, you must also consider that our understanding of this science is still no more than interpretation and processing of perceptions. You cannot get around the assertion that everything that we claim to be 'real' is just a result of our perception of it, and that for the individual, the only thing that really is is that which is experienced. This is probably not a new argument to most of you, but I'm interested in how you get around that.
2. Based off of this, we cannot disprove that we are no more than a brain or some entity sitting in a beaker being given stimuli that we receive as 'perception' and from which we have created in our minds what we call this 'reality' (again, an old argument, and quite tired -- see the Matrix or skepticism philosophy).
3. Here's where it gets tricky, and I haven't completely got my head around this point myself, but here goes: Once we accept (and we must) that all that is, for an individual, is that which that individual perceives and experiences, then the notion of the individual ceasing to exist becomes an impossibility. Well, I guess I can say that this is only true for me, because though your posts are all nice to read I must accept that I cannot prove that any of you truly exist. The end of me would mean the end of everything because I would not be there to experience it... but there must be something. Furthermore, my death can only be realized if I experience it happening AND having happened. Just as you do not realize that you have lost consciousness until you have regained it (tho you may still be sleeping). Although 'nothing' happened to you while sleeping, that 'nothing' does not exist until you realize it.
4. From this idea, I have to accept that something must be experienced, by me, after my death. The antithesis is inconceivable, it is like dividing by zero.
5. And finally, many of the posts I have read have ignored the fact that they are confining existence to the dimensions that we think we understand in this reality. Most blaring is the notion of time. People talk about a 'boring eternity' and 'living forever'. Eternity and forever are concepts which require the passage of time. Though it is admittedly difficult to do, if one ceases to think of death and the next 'life' as something that exists in 'time', the concept of that life existing becomes easier to accept.
Anyhow, just my thoughts. In summary, when this body dies, our being must experience SOMETHING (anything besides nothing), though I would not assume to know what that something is.