You can certainly try setting the services to manual. I would be cautious about disabling, though.
I used Black Vipers suggestions with XP, and the results were very noticeable. However, with faster computers (generally), I doubt you will discern any performance difference.
Windows 7 architecture is quite different from , fo example, XP. The services will mostly load anyway. But most will not use any resources until that services is required.
Items I have found, however, which slow down the computer, particuarly at the start, are Windows defender and the Search facility, for which I have little use. These are, indeed, services which can be disabled, as they are actually running built in programs on start up. I am not sure if it is a speed or startup hog, but I also disabled the home group service facilities, as I do not use them. Security centre and Windows backup went the same way.
Many third party programs automatically place an entry in the Msconfig starup section. The fact is that all will run anyway, on demand. Such things as Itunes real etc. I have only my anti virus program ticked under that tab. Even the Java update I have unticked. I occasionally do a manual update of the program.