I have been using IE 7 beta 2 7.0.5346.5 for several weeks now, on XP SP2. On just three occasions, when ckicking the x top right to close it, instead of closing normally, it reported that it had a problem with sdhelper, then closed. I let it send the report to the IE 7 beta team. No details of what kind of problems were given.

I'm using Spybot 1.4, all updates, not using teatimer, but sdhelper ticked in Spybot and enabled in IE 7 manage addons.

I've not had any other IE 7 crashes.

As this is a rare (and as far as I can tell random) event I'm not seriously concerned, but just thought I'd post in case it may be helpful. IE 7 final for XP SP2 will be released later this year, so it is important to check its stability in conjunction with Spybot.