While not exhaustive or situation specific, these are the general set of spells I think druids would be most likely to prepare from each day.
Zero: Cure Minor Wounds, Create Water, Dawn (SC), Detect Magic, Guidance, Groundsmoke (Dragon Mag. 326 @ 73), Light, Know Direction, Read Magic
First: Aspect of the Wolf (SC), Beastland Ferocity (SC), Entangle, Healthful Rest (SC), Impeding Stones (City), Obscuring Mist, Omen of Peril (SC), Produce Flame, Shillelagh, Vigor--Lesser (SC)
Second: Blinding Spittle (SC), Bone Talisman (WoTC), Gust of Wind, Kelpstrand (SC), Master Air (SC)Snake's Swifness--Mass (SC), Splinterbolt (SC), Venomfire (SK)
Third: Alter Fortune (PHII), Crumble (SC), Energy Vortex (SC), Heart of Water (CM), Magic Fang--Greater, Poison, Primal Instinct (DrM), Sleet Storm, Spiritjaws (SC), Stone Shape, Venomfire (SK), Vigor (SC)
Fourth: Boreal Wind (Frost), Blast of Sand (Sand), Enhance Wild Shape (SC), Friendly Fire (EoE), Giant Vermin, Heart of Earth (CM), Langour (SC), Last Breath (SC), Luminous Armor--Greater (BoED), Moon Bolt (SC), Murderous Mist (SC), Sheltered Vitality (SC), Vortex of Teeth (SC)
Fifth: Animal Growth, Baleful Polymorph, Blizzard (Frost), Call Avalanche (Frost), Control Winds, Owl's Insight (SC), Phantom Stag (SC), Plant Body (SC), Vigor--Greater (SC)
Sixth: Antilife Shell, Bite of the Werebear (SC), Dispel Magic--Greater, Energy Immunity (SC), Mummify (Sand), Resistance--Superior (SC), Spellstaff
Seventh: Control Weather, Heal, Master Earth (SC), Rain of Roses (BoED), Slime Wave (SC), True Seeing, Word of Balance (SC)
Eighth: Bombardment (SC), Frostfell (Frost), Red Tide (SC), Unearthly Beauty (BoED), Word of Recall
Ninth: Nature's Avatar (SC), Shapechange, Summon Elemental Monolith (SC), Undermaster (SC)
I'm sure I'm missing some obvious ones, but the above is a start.