Hi Ngala,
I generally think, what would they need to know for? if it is to help you get the job then great, if it is just because you think you should tell them, then it isn't relevant to the resume.

In the recruitment phase, They don't need to know and by law are not allowed to ask for; date of birth, marital status, sexual orientation, family situation anything that they can base descrimination on.

Think of a resume as a way to get the interview, it needs to entice (max 3 pages) them to call you for an interview, that happens when you match the recruitment criteria.

Once in the interview, you can dazzle with your personality, and share any details you feel are relevant.

I wouldn't put the maternity leave on as it isn't relevant, and you are still an employee of your current employer.

Q. Lets say its july 09, you returned to your current job and have been back for 1 year, would you write that you had taken maternity leave?
July 04 - July 07
July 07 - July 08 - Maternity Leave
July -08 - july 09

Or would you just write
July 04 - july 09

If you wouldn't put the mat leave in then, it isn't relevant now. If you think you can do the job, then that is all that matters.

And I sooooooo agree with Nadine, formating is esential, there is nothing worse than having to read a resume of someone who hasn't put in the effort to look back though their own resume.