CPU-Z is probably the most popular desktop processor identification utility.
It's intutive, flexible, always up-to-date and provides a lot of basic information about components running:
In addition, it comes with online validation tool, which allows users to submit and share your overclock your results with community.

To download CPU-Z, please proceed to its' home page. Note that in order to get validation working you have to use the latest version of CPU-Z.
Main
World records
DDR
phobos - 257.8 MHz

DDR2
phobos - 620 MHz

Top overclockers
Most scores:
1. phobos32

Most records:
1. phobos4

Info
Statistics
4Queries:
Time needed:

select * from memoc_dictionary where name='app_id'

SELECT d1.id, d1.value as mem_type, ms.id, ms.speed, ms.memory_type, dd1.value AS brand_name, dd2.value AS model_name, u.id AS user_id, u.user_login FROM memoc_dictionary d1 INNER JOIN memoc_scores ms ON d1.id = ms.memory_type AND ms.speed = ( SELECT max( ms.speed ) FROM memoc_scores ms2 WHERE ms2.memory_type = ms.memory_type ORDER BY ms2.posting_date DESC ) AND ms.id = ( SELECT ms3.id FROM memoc_scores ms3 WHERE ms3.memory_type = ms.memory_type ORDER BY ms3.speed DESC , ms3.posting_date DESC LIMIT 1 ) INNER JOIN memoc_sticks s ON ms.sticks_id = s.id INNER JOIN memoc_dictionary dd1 ON s.brand_id = dd1.id INNER JOIN memoc_dictionary dd2 ON s.model_id = dd2.id INNER JOIN memoc_users u ON ms.user_id = u.id WHERE d1.dict_group = 'mem_type' ORDER BY d1.value ASC ;

select id, user_login, max(score_count) as score_count from (select u.id, u.user_login, count(s.id) as score_count from memoc_scores s inner join memoc_users u on s.user_id = u.id where s.approved = 1 group by u.id, u.user_login) as us group by id, user_login limit 0, 4

SELECT s.user_id, u.user_login, count( s.id ) AS score_count FROM memoc_scores s INNER JOIN memoc_users u ON s.user_id = u.id WHERE s.position = 1 and s.approved = 1 GROUP BY s.user_id LIMIT 0, 5