Frames are a good selection when you know the site will recieve lots of additions and new categories. Howeer, it is important to design the site for access by people who don't like to use frames or who are using viewers designed for physically challenged folks. Ease of maintenance is a factor. Once the frames site is constructed, updates and additions are made via templates. A large site such as the 85 file RCD Center uses frames for the ease of adding and subtracting material, and each content page is also designed to be viewed without frames for complete all-visitor access.
Splash pages are a means of showcasing some special effects.
This is a nice way of showing new visuals, but you wouldn't want to have this amount of visuals on every page of your site due to the long load time. A final tip is to use available online resources. The internet is a great place to find graphics and techical assistance to help you build better web sites. Here is a list of resources I frequently use.