N.-
I see a lot of moms have already recommended evite.com
The same website popped into my mind. I have not personally created an invitation using evite, but I have received many birthday invitations via evite.com. I love this site for getting the invitation and quickly responding to the person inviting me/or my kids.
Try not to stress out over it. You can always send a photo card of your son during the holiday season.... and that will be here sooner than we sometimes expect! I have not received evites with personalized photos of the party person, but I think you're able to do that, too.
I do LOVE using snapfish.com for organizing my photos into albums, making photo gifts, Christimas cards, etc.... It's a free site to organize albums and share with others. Sign up (free) to have them email you sales... such as half off calendars (actually that's going on today and tomorrow)Great deal-, free shipping and handling, etc... Shutterfly is simliar too, but I have not tried them. So far I have been just storing all my photos with Snapfish.
I think you should give evite.com a try first for the invitaions, though. It's free and like I said, it's so simple to rsvp and that's all online for you to keep track of who is coming, who is not coming and the "maybe" list.
Have fun with your soon to be one year old! What a fun time!
J.