I think it's more a branding thing. If you brand "bluewidgets" most people will type in bluewidgets.com instead of bluewidgets.net. On the other hand, hosting companies ofter seem to like dot net better.
For SE's there are no difference between TLD's. .com, .net, .org, .biz, .edu, .gov - they are all the same
If you are going to get type ins...you should try to get .com extensions...as for SE's it really doesn't matter. It really depends on your site content. For some sites .org is muchmore suitable than .com...just make sure its one of the TLDs people are aware of instead of .name, .this, .that etc.
Exactly, TLD doesn't matter at all. But what do you say about edu/gov extensions? It seems like SE's reward them much more than common extensions. I know links from edu/gov sites have some more value than com/net.
not everyone can register .edu or .gov websites and therefore they seem to have more value. As fas as links from these sites..they don't make much difference..they're the same as links from other sites and ..I think Matt Cutts recently said the same thing somewhere in his blog
The tlds don't make any difference in the search engine rankings of a site. It's for the branding purpose and type in traffic point of view that people prefer .com. It is also believed that .edu and .gov sites tend to rank higher than others but I m not too sure about it.
They maybe rank higher because of quality of their backlinks not because of TLD. Google see all TLD's the same.