Create aliases for your gmail address

From The Official Gmail blog, there are two ways for you to "create" more gmail addresses by using your own gmail account.

• Append a plus ("+") sign and any combination of words or numbers after your email address. For example, if your name was hikingfan@gmail.com, you could send mail to hikingfan+friends@gmail.com or hikingfan+mailinglists@gmail.com.
• Insert one or several dots (".") anywhere in your email address. Gmail doesn't recognize periods as characters in addresses -- we just ignore them. For example, you could tell people your address was hikingfan@gmail.com, hiking.fan@gmail.com or hi.kin.g.fan@gmail.com. (We understand that there has been some confusion about this in the past, but to settle it once and for all, you can indeed receive mail at all the variations with dots.)

Also you could combine those two "techniques" to create something like h.i.k.i.n.g.f.a.n+sungamagnus@gmail.com. Using this and gmail filter, you could give out "different" gmail addresses to different people/groups/mailing lists and filter them to different lable in your gmail.