Mani,

I just made two posts in this forum.  The posts were in the forum previously and I am trying to find out where they went.  I have given you good books and website with some comments where necessary.  These are my opinions and I am sure others will add to the list. 

I like the Project Workout by Robert Buttrick. Includes a CD of templates :)

www.projectworkout.co.uk or check out amazon etc

You might try this site:

http://www.pmproducts.net/

Essentials of Strategic Project Management (Callahan / Brooks)

While not really written for the PM level of project mgmt, it would be a great tool to help shape the formation of a PMO or enterprise-wide mgmt office.

If you want some straight forward, practical and real-world info that does not try to force-feed any specific methodology I can highly recommend

'No-Nonsense Advice for Successful Projects' by Neal Whitten.

I've also attended Neal's 2 day seminar on the same topic and it's great, but even the book alone will give you plenty of food for thought.  It is exceptionally well written and has a great Q-A section at the end of each short chapter.  (He recently released a follow-up which is on my list to read ASAP)

For advice on PMO setup you might wanty to look at "The Complete Project Management Office Handbook" - although at over 700 pages it may be a bit tough to digest up front (but I'll leave that up to you).