I'm with JWZ on this one: http://www.jwz.org/doc/tabs-vs-spaces.html

Definately tabs.

Why? Because it's neater. It takes bloody ages to delete a whole load of spaces, whereas only a few seconds to delete around 3-4 tabs.

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Both!

I code in SQL, and TABs are an absolute must to line things up. In PL/SQL code, however, i use a space for indentation so the code does not go off the side.

A kind of rule would be: space when it is block indentation, tab when it is clause indentation.

Tabs AND Spaces.

I use tabs at the front of lines to indicate indent level, while spaces are used after the code in a line starts to line up things.

8-char tabs, all the time.

1) I usually work with PHP, which doesn't care about tabs or spaces.
2) I always use a GUI editor, 1680 pixels wide.

I spend most of my time in Python, so 4 spaces it is.

http://www.python.org/dev/peps/pep-0008/

4 spaces.

I use 4 spaces because we (that is, the team I work with) follows the Zend Framework coding guidelines.

But I think using tabs makes a lot more sense. That's what tabs are for, after all: aligning things. And it's nice to be able to define a tab size that suits you, regardless of what the others are using.

Definetely spaces. The reason is simple, "a single space" always has a fixed width, whereas "a single tab" is a vague concept whose width depends entirely on the user. So, for interoperability causes and stuff like that, I say spaces.

Those are too attached to tabs can use soft tabs anyway.

I'm a Rubyist, so a size 2 soft tab for me.

SPACES! Tabs are so annoying and there is nothing worse than when some dude edits your code with Visual Studio or something and starts inter-mixing tabs and spaces. Even worse when they have their tabstop set at 8 chars.

Even if you like using the tab key configure your editor to enter "4 spaces" for a tab. All good editors can do this. And if you use vim... this command is your friend:

:retab

+1