Use Firefox not Internet Explorer 7
If you're not sure what version of Internet Explorer you've got, just go ahead and use Firefox anyway. You're less likely to have problems getting Centra to run properly.
If you don't have Firefox go get it right now by clicking the big green button that looks like this image at http://www.mozilla.com/en-US/
On Windows, Firefox will even import your Internet Explorer "Favorites" when first installed. It will ask you if that's ok, and if you say yes it will walk you thru the process quickly and easily
as shown here. It's nearly magic!
FYI - there is a new version of IE7 that will work with Centra....
There are some neat tips/topics on the Centra blog. I read about this in the April TNT newsletter.
I've been having trouble with Firefox bookmarks. When I try to add a page, it won't take it (nothing happens) - I have to select a 2ndary folder in a drop down, but when I click to add, it adds a link, but does not create a title in the bookmark folder (in other words, the entry is blank). Any ideas?