Digital Camera - Extra Memory
Most cameras come with a "starter" memory card that can only hold a handful of pictures. It is well worth buying a card to expand your camera's memory, especially as prices have dropped dramatically in recent years. Make sure to check that the extra memory format is compatible with your camera (especially if you buy a Sony). To learn how many pictures you can fit on to a memory card, check out this handy table: http://www.camerafarm.com.au/camera/customer/pages.php?pageid=22.
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$17
With this well-priced 4GB card, you can take roughly 1000 pictures before you have to upload them to your computer. This is the entry "Class 2" level card; if you get the Class 4 or 6, the uploading will be faster; this is more important with larger cards that store more files.
$43
If you are getting a Sony camera, this is the compatible memory card (Sony calls it a Memory Stick). With this 4GB card, you can take roughly 1000 pictures before you have to upload them to your computer.
$100
If you don't mind spending an extra $80, this Eye-Fi card gives you the convenience of being able to send your pictures to your computer wirelessly and automatically when you are in range of your home wireless network. This card also allows you to do the same trick with sites like Flickr, enabling you to easily share your pictures with friends and family. Its 2-gigabyte memory will store roughly 500 pictures.
$130
With many of the same features as the Eye-Fi Share, the Explore does the extra trick of putting an invisible stamp with the location where you took the picture. This "geotagging" feature works in most places you are likely to be with a baby (but because it relies on Wi-Fi technology, it doesn't work as well if you are in places like the woods, in a boat or in some foreign countries). Its 2-gigabyte memory will store roughly 500 pictures.