Avoid Deck Rot with Flashing Tape - Pressure-treated lumber that stays wet will eventually rot. Flashing tape keeps water from getting trapped between doubled-up joists. If you're resurfacing an existing deck frame, tape over any joists that have a lot of holes from the previous nails or screws. Buy black tape if you can find it; shiny silver and white tapes may be noticeable between the gaps in the decking. The tape shown will be covered by the perimeter deck board.
Raised bed/planter/fence/privacy screen: this is now featured at http://www.instructables.com/id/HOW-TO-BUILD-MULTI-USE-RAISED-BED-PLANTERS-WITH-PR/ with complete instructions for building a planter with a back 48"H. You can get a PDF too. Please vote for me in the "Outdoor Structures" contest. Thanx!!