Apache Tuning (with Drupal in mind!)

My best solution for most LAMP's is the following,

I see that a lot of administrators just using apache as-is
Coz there are so many pages about every tool I'm blogging my conclusion with my experience of using apache.
(and how to improve the default configuration)

Php and drupal:

You can use php compiled in apache, but then you can only work with a prefork!
This consumes very much memory (possible 20MB(and more) per available worker
Every worker will grow depending of your php scripts and is in need of a lot of memory

I now some of you have enough resources to buy GB's of memory But I don't
So its time for tuning coz I can only run 15reauest/sec on my default setup
(xen guest, 2cpu 3Ghz and 512MB memory)(the db is in a other guest)

If I calculate (I now I can't but I use expr) I reserve 128MB for the system so there is 384Free @a rate of 20MB/worker I have space for 19 a 20 available connections
That is not so much for a popular website (not mine)

So here is my Apache Tuning with no extra resources in mind.