Do you buy related domains early on (.net, .org, similar spellings)?
ErrantX: not always. I usualy grab .com, .co.uk and .net. I get .org if I thikn in the future it might work for a organisation / charity but I dont redirect to the related site.I dont buy misspellings usually....What I do do though is if I think of an idea and find a good domain for it I grab the domain; I think I have around 50-80 domain names (not unique; that  includes the TLD variants) sat waiting for my projects to go on them.