My standard set of photo gear for walking around and taking photos has expanded considerably, of late. It now includes:
- Canon Rebel XS dSLR
- Canon Powershot A570IS
- Canon 28-105mm f/3.5-4.5 lens
- Canon 18-55mm f/3.5-5.6 IS lens
- Lens hoods
- Canon 430EX II flash
- PC to hotshoe adapter
- Sto-fen omnibounce diffuser
- CyberSync flash trigger and receiver
- Collapsable reflector
- Ultrapod mini tripod (for A570IS)
- Ultrapod tripod (for Rebel XS)
- Polarizing filter
- Lens cleaning equipment
- Extra batteries (dSLR and AAs)
- Plastic zip-loc bag, to prevent condensation when moving from cold to warm places
Among these, the polarizing filter is probably the least used item. The most useful item relative to its price is the Ultrapod mini tripod.
A useful and affordable addition would be a clamp for attaching the flash to things. The addition that I think would be most useful is a 70-200mm lens. It would allow for much better wildlife photography, as well as more capability at concerts and similar events.
See also: Building a 35mm camera system.