The following CSS should disable preview and put the Cached and Similar links back into the correct spot. I use UserCSS in Opera, not sure what to use in other browsers but I know there are solutions for custom CSS available:

    .vspib { display: none !important; } /* This is the preview specific line */

    .vshid {
        display: inline !IMPORTANT;
        padding-left: .7em !important;
    }
    .vshid > a {
        color: #1122cc !important;
        text-decoration: none !important;
    }
    .vshid > a:hover { text-decoration: underline !important; }
    .vshid > a:visited { color: #6611cc; }

This next bit of CSS should puts the URL back below the snippet text. It works for most result types but there are a few where it's buggy, for example any results that show how many people "+1'd" a URL:

    li.g .s,
    li.g.videobox .s > table.ts > tbody > tr > td > div
        { padding-bottom: 1.4em !important; }  /* Make room for the moved URL */
    li.g.videobox .s { padding-bottom: .5em !important; }
    li.g.videobox .s > table td > div { position: relative !important; }
    li.g .s > .f.kv, li.g.videobox .s > table .kvm {
        position: absolute !important;
        bottom: 0 !important;
    }

I have Instant disabled so the above CSS may or may not play well with Instant enabled.