Here a screenshot from FF3 but it looks the same on both IE7 and FF also IE7. As you can see the fields are slightly off to left of the heading titles.
Ok, now if you have more than one search criteria in list, are the input boxes aligned (e.g. the input text box of Username not appended to its label "Username") ?
Would be easier to check with a url and if needed a login (you can pm me from my profile if needed clicking on the person icon bottom left of this post)