
Here are some links with helpful tips for preventing pests from entering your home as well as what to do if they've already made a home in your home.
Dealing with Mice, Bats, Deer, and Other Pests [Real Simple]
How to Keep Pests Out of Your House [This Old House]
Controlling Pests: Roaches, Mice, Rats [Children's Environmental Health Centers]

We agree with Jason who states "Popcorn belongs in a movie theater bucket drenched in butter, not on a ceiling. Cottage Cheese? Well let’s just say it’s something I never want to see in large quantities when I look up."
Popcorn ceilings are widespread in homes built during the 60's and 70's and may contain asbestos which makes their removal a more costly and difficult process. If you no longer want to live under a veil of cottage cheese then these step-by-steps from DoItYourself.com and Jasongraphix should be enough to convince you to remove or keep your textured ceiling.

Selecting the right caulk for your job is important and it may be a bit intimidating to see the variety available at your local hardware store. Silicon Caulk is by far the most popular type of caulk that can be used in many different applications but is has it's drawbacks such as it's difficult removal and bad odor. Here are some other caulk alternatives and how to use them.
DIY Caulking [repair-home.com]
How to Clean Up Silicon Caulking [eHow]
Choosing The Right Caulking [ezine]
How to caulk or recaulk a bathtub or shower enclosure [Natural Handyman]