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For previewing your own pages, the closest you can come is to take advantage of IE6's <!doctype> detection & standards/quirk mode switching.
I use this feature when testing new pages. Since I code using a "standards-inducing" <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">, IE6 will display the page with Web Standards mode.
To see how the page will display in "quirk mode" (as in IE5.5) I remove the <!doctype> and reload the page for viewing using my editor.
This is an important step when designing sites using CSS, especially where margins, padding and borders have been declared for various elements. The IE/Box Model needs to be kept in check... ;)
If you do not use a <!doctype> IE6 will simply (and quite possibly incorrectly!) display your pages in "quirk mode"...
Adopt a <!doctype>!