Around this time of year there are always people looking for "stocking stuffer" gifts for the photographers in their family. Here's an assortment of useful items at prices that won't break the bank. Most are under $50 and many are under $25.
Many DSLRs, especially higher end DSLRs use CF (Compact Flash) memory.
Most compact digital cameras now use SDHC cards. To be able to shoot HD video you need a card that's at least a class 6 speed. All these cards should be fine.
Even with image stabilization, a solid camera support can be very useful, especially when working in low light (or for self portraits).
The AA battery is used in a lot of photo accessories such as flash units and auxilliary lights for video. It makes sense to use NiMH rechargeable batteries since they give more power, last longer and work out MUCH cheaper in the long run (not to mention it's much more environmentally friendly to recharge batteries 500 times than throw 500 alkaline AA cells into a landfill).
You can never have too many camera bags (well, you can, but you'd need a lot to qualify). Sometimes you need a small bag, sometimes a bigger bag and sometimes a backpack.