Cons of IE8
Internet Explorer 8 does indicate to you up to five sites that are similar to the one that you have opened. But, this is restricted to the better known sites which have better page rankings. However, a user is generally already aware of such sites. This additional list can only be of help if the sites listed are some of the more unfamiliar ones that are not so frequently visited. This would broaden the web experience.
IE8 recommends a minimum of between 64 MB and 512 MB of memory. However, this seems inadequate and is better served with a memory of at least 2 GB. This would mean that home users and small business users may be forced to go in for costly upgrades if they are not to find the performance of IE8 disappointing.
Page Display of Sites
Sites that have still not complied with the latest web standards may not display easily or correctly in IE8. The compatibility button does not easily open all such sites, and you may be forced to wait for the upgrade of the site itself before you can view it properly.
Microsoft Playing Catch Up
IE8 really seems like an effort by Microsoft to catch up with other browsers like Firefox but no real attempt at anything new. So, whether this will help Microsoft retain its market share is something the market has to decide.
Heavy to Load
Internet Explorer 8 is quite heavy to load, and smaller home users may have to watch their hard drives before they can decide on an upgrade to IE8.
These were some of the pros and cons of Internet Explorer 8. If you think I missed anything, please let me know using the comments section.