DF,
Gaffa's got it pretty-much right. You should put (C) 200x Your Name on anything with your material. You should register your material with the US Office of Copyrights. It's currently $30 for each registration. You CAN register multiple works/songs in one application and pay only $30. This is called a "compilation". So on the form call the title "Matt Good Compilation X" or something like that.
There are two forms of copyright registration: Form PA and Form SR. Fill out form PA, if you're just protecting your work and don't plan to release that particular recorded version of the material to the public (for sale, lease, gift, etc). Fill out the Form SR if you will sell that particular version of the songs.
You'll need to send in copies of the printed song lyrics for both forms. With Form PA you'll need to send in one cassette/CD of the material that you're copywriting. With Form SR, you'll need to send in two copies of the material in the Form that you'll sell it in (i.e. the completed recording in its printed case and shell with artwork, etc).
So the long and the short of it is: if you just want to catalog your songs, put them on a tape, type the lyrics and send Form PA to the US Office of Copyrights. When you have the final version that you are releasing on a CD project, fill out Form SR and send in the completed version the US Office of Copyrights. This way, your material is protected and registered while you're still working it out in the studio and the sound recording will be protected. Hope this helps.
Rev E