Check back in the board a bit - there are a lot of these.
1. I'd include it for closer family/friends would would ABSOLUTELY be there if they lived in town and include a note that you know they might not be able to make it but that they will be there in spirit.
2. If it's someone you don't know well - save the shower invite and send a birth announcement later - to me this seems gift grabby...
3. I got annoyed with my MIL who "had" to invite all sorts of out of town people becuse they are related to someone in town and if they talked about it someone would get hurt feelings... ugh...
4. Don't do regrets only - I regret it though it wasn't my choice. My Mom and Sister are putting the shower on for me but since both sides are invited, I've been made the go-between and they keep asking who is coming because they haven't heard much from ANYONE!!