Thanks for the responses, guys. I went ahead and planted 1000 this evening. I think I probably should have planted them about a month ago, but oh well. I've got another packet of 1000 seeds that I think I'll scarify by placing them in the freezer over night, then pouring boiling water over them and letting them soak for a few hours. Then I'll toss them w/ a packet of rhizobium bacteria and plant them around the yard. I probably planted about 500 of today's about 1/8" under ground and then just scattered the rest. Will probably do the same when I plant this next batch.
I imagine the worst case scenario is not all the seeds germinate this year and we wind up with some germinating a year or two from now (and likely with some late blooming plants). If I get a 10% germination rate from these, I'll be pleased. My mom's been trying to get them to take in her yard, but only had roughly 5 or 7 plants this past Spring (not sure how many seeds she used). I'm hoping for a decent surprise for her either this Spring or next. There's one field about a mile from here that was painted blue with bluebonnets so I'm hoping to have a decent flowering of them this Spring.
EDIT: I've been reading conflicting advice in regards to scarifying the seeds. So I planted 1 packet of 1000 without, and will scarify the other packet of 1000 according to video instruction by the horticulture director @ the Lady Bird Johnson Wildflower Center:
link.