I have used Rain Bird components for my drip irrigation system. Sprinkler Warehouse carries a large selection of their parts at very competitive prices. They also carry DIG Corp and Hunter drip components.
Their site also has a "Sprinkler School" section with useful information for planning and installing your system.
I would recommend looking at this site for any of your irrigation needs.
You can add Notes to your Garden Logbook with the level of detail you require. These Notes may record specific Actions (ex. fertilize, water, harvest), Observations (ex. flavor and taste, yield) or general information. You can also attach specific plants and photos to these notes.