Both of mine were early talkers as well. I also had to remind myself that the little tot who just spouted off a paragraph was just a "baby" :-)
I'll echo the comments about reading. We can never get too much of the library. You can also pick books on a theme that will give you an opportunity to look at something more in-depth. For example, get a bunch of books on or about cows. You can talk about where cows live, what they eat, what their babies are called, body parts, etc (it was great to point out hooves... then see the kids notice that sheep and deer had them too!).
You can carry the theme further with a video about farm animals, and find a simple craft online, drive out to a near-by cow pasture (how very Texasn that there's never one far away) and look at the cows, and make a trip to Chick Fil A and see the big cow cut-out...
You can find great ideas for theme-based learning at www.letteroftheweek.com. It's a free online preschool curriculum.
The other thing is just to narrate your day for her and involve her in whatever is reasonable. If you're making pancakes, let her help get the ingredients out and pour things into a bowl, tell her what everything is and how you're going to use it.
For letters, a trip to the grocery store is great. The cereal isle in particular. Also, there's a super Leap Frog video called Letter Factory. I mean SUPER. I don't normally leave educational experiences to the TV, but this DVD is amazing. Run through it a couple times and she'll know the alphabet and sounds.