(I'm sorry if this is repeating what has already been said but I couldn't be bothered to read back through the whole 4 pages of comments!)
Suicide should be the right of every person but I personally think too many people turn to it too quickly as it is an easy choice. I also see it as a cowards choice. Only people too scared to face their problems make that choice. I've known people who have reached the bottom (lost everything that meant anything to them) but have had the strength to pick themselves up and make their lives better.
My other problem with suicide is the fact too many damn people use it as a threat to get attention. I've had too many friends call me and tell me they are going to kill themselves and when they feel they have had enough attention have gone to bed and apologised the next day. I've spent the night crying with worry and frantic that they will follow through gone round to see them. Why do such a thing to a friend?! Now that is selfish.
I'm afraid these days I tend to ignore it and have grown a bit of a shell. If that is the only choice they see then let them take it. Wow... I sound really mean.
Of course, as others have mentioned I see Euthanasia as a totally different case. This often involves people who are not healthy, do not have any basic quality of life and are not likely to see a better future. This is not the same as some spotty 14 year old kid who thinks that they might have flunked their english exam.
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"I never make stupid mistakes, only very very clever ones" - John Peel