We love double-duty products, since we're a little bit obsessed with maximizing small spaces. End tables can be really versatile pieces, doubling as storage or serving multiple functions. A chest (like this one shown in an image from Living Etc) makes a great end table. Click below for other ideas...
The Stow Leather Storage Ottoman ($169) from Crate and Barrel acts as an end table, ottoman, storage spot, and serving tray (when you flip the lid).
The Kiki Table from Chiasso ($48) works as an end table, nightstand, or tray. Remove the top to serve drinks, or pair a few of them together to create a multipurpose coffee table.
Karim Rashid's Magino Stool ($330) is an end table, stool, and magazine rack all in one. The clear acrylic takes up minimal visual space in a small apartment.
The stacked surfaces of the Ozomi end table ($299) can accommodate a table lamp, magazines, and other odds and ends. By changing the position of the parts, this table can be assembled in different configurations.
The ceramic Lotus Stool ($269 at Viva Terra) works in a living room, garden, or bathroom. Use as a stool, end table, or plant stand.
Store the Bekvam Step Stool ($14.99 at IKEA) next to a sofa, and pull it out when you need to reach a high spot. It's made of solid beech wood that can be painted any color you choose.
The Victoria Hagan Perfect Pieces Bethany Trunk would fit in with a wide range of decors, and it's pretty affordable at $69.