This is one of those pages that grows as I gather more information.

I got these from a beautiful site that is no longer online.

Invocation to the Goddess
I invoke and call upon thee O Mother Goddess,
who shines for all, who flows through all.
Maiden, Mother and Crone,
I invite you to my circle;
Touch us, change us, make us whole.

Invocation to the God
I invoke and call upon thee O Father God,
Lord of the Sun, Master of all that is wild and free.
I invite you to my circle;
Touch us, change us, make us whole.

This is a blessing from Scott Cunningham's book, "Wicca:  A Guide for the Solitary Practitioner."  I've modified it a little to suit my needs.   This chant can also act as a general invocation to begin a ritual.

May the powers of The One,
the source of all creation;
all-pervasive, omnipotent, eternal;
may the Goddess,
the Lady of the Moon;
and the God,
Horned Hunter of the Sun;
may the powers of the spirits of the corners,
rulers of the elemental realms;
may the powers of the stars above and the Earth below,
bless this place, and this time, and I who am with You.