and of them really new ones are?

TEN reasons NOT to upgrade to Vista:

1: For optimal performance it needs 2 or even 4 GB RAM
2: If you install it on a system XP is already installed XP won't work unless you reinstall it
3. Programs that works perfectly under XP (like Adobe) fails on Vista
4. Full with bugs (everytime I visit this site I can read about a new one)
5. You need a DVD to install and huge amount of disk space
6. BIOS incompatibility
7. OneCare fails lots of security tests
8. Terrible GUI (I don't liked even the new XP GUI with those very stupid and useless skins)
9 Full of vulnerabilities (just like bugs)
10. Sometimes it does not recognize your HDD

The first questions that comes immediately after the lecture of your comment: HAVE YOU EVER TRIED/INSTALLED VISTA?

Let me tell you my answer to your 10 points (and I have installed Vista on two different PCs - and soon more...)
1. Correct, but works also nice with 1 GB.
2. False, I installed Vista over XP and XP runs just fine - of course on different partitions :)
3. The whole Adobe CS2 Suited runs on Vista, the problem is that Adobe doesn't offer support for it. Other programs runs well on Vista, except most anti-viruses and software that installs deep into the system. I used even some XP drivers for some hardware on Vista. Anyway, this point is going to change much in the future... and think about switching to x64.
4. What you read from the websites is a collection of bugs. If you will install Vista you will not see all these bugs. Anyway, this can be changed and I believe Microsoft is working on it.
5. That's not anymore a problem. It was some years ago.
6. You have to try first and then I will listen to you.
7. OneCare is not included with Vista. You can install third-party antivirus software.
8. If you don't like it, you can disable it. Others (the majority) likes it.
9. You have to wait at least one year to make this affirmation. If somebody says so doesn't mean it is true.
10. Same as point 6.

My advice: when you read something on the websites make selections and don't believe everything.
Personally, especially on Vista subject, I was impressed with the number of the negative subjects on it and that was what pointed me more to try it.

My opinion:
- some of them aren't new
- about some I don't care - I don't need them
- some are annoying me
So, for me remains only approximatively 10 points :(

Vista has matured, and gotten cheaper. Things work perfectly with it. SP1 has been out for months, and vista is enjoying a 17%+ Market share.

More reasons:
1) Stronger Firewall
2) Self regulating internet that adapts to the speed.
3) More stable
4) More friendly
5) Smarter Superfetch

Reasons not to:
1)If your ok with XP, there no real reason to upgrade to vista unless you beat the recommend requirements.
2) It tends to chew your hard drive, so keep your backups ready.