I just downloaded the Beta 2 version of Internet Explorer 8.0 and I have compatibility issues with WordPress.
1) Currently I am using BluelineRC theme. Even though it is an older theme for me it is a theme that seems to be dependable and until it displays properly in multiple browsers. On my home page only the most recent blog is displayed with no texts. All I am able to view is title and for the blog text it shows "<!--[endif]-->".
2) After logging in and if I go to Manage>Post to bring up a listing of my posts to view wp-admin/edit displays fine. However when you click on the link for a selected post you are brought to wp-admin/post no text shows in the text box but the title does show in the title box.
3) Zdstats plug-in only partially displays. The graphs that Zdstats generates (e.g. visitors today and technology for example) does not display only the statistics in data form will display.
At least from a consumer of WordPress perspective this highlights four issues for me.
#1: Internet Explorer 8.0 once the beta testing is completed may not be compatible with all plugins. Meaning those who are developing plug-in need to be sensitive about browser compatibility especially since Internet Explorer still remains the most popular browser.
#2: WordPress development team needs to ensure any releases take into account Internet Explorer 8.0 issues and work to resolve them.
#3: Theme developers need to take into consideration how their themes are likely to be displayed in Internet Explorer 8.0
#4: Theme developers, plug-in developers, and WordPress development team needs to be proactive in managing compatibility issues with Internet Explorer 8.0 and not wait for users to begin to log issues regarding them.