Linksys' LGS552P is a PoE managed switch with lots of Gigabit ports and a bit of Layer 3 features.
TP-LINK's TL-SG108E and TL-SG2008 both provide enough managed switch features to satisfy the requirements of most small networks.
ZyXEL's GS1900-8HP combines the managed switch features a small network needs plus plenty of PoE power at a surprisingly low price.
ZyXEL has announced a line of smart Gigabit Ethernet switches.
HP's PS1810-8G smart switch is a bit limited on some features, but comes with an excellent warranty.
EnGenius has announced a trio of Gigabit PoE smart switches.
A Layer 3 switch can provide routable VLANs without having to change your router.
Updated - NETGEAR's M4100-D12G switch can do a few tricks, like routing, that other affordable smart switches usually can't perform.
TRENDnet's TEG-160WS is a decent 16 port Gigabit smart switch, but missing a few key features that even low-end products should have.