After seeing a lot of stuff about Diigo floating around in the ether, I thought I should sign up and give it a try (as I do with these web 2.0 tools!). So far I have been reasonably happy with it, although it does seem to lack some functionality that I rather like on Delicious (I have still kept my Delicious account running whilst I play with Diigo). For example, Diigo doesn’t suggest tags like Delicious does (at least as far as I can fathom). When I tag a page on Delicious, not only does it offer recommended tags (both from other users applied tags and my own), it will also predict what tag I am adding as I type it. This makes my life much easier as it keeps my tags neatly organised. With Delicious I can start typing in a tag and see instantly if this is a tag I would normally use (Delicious informs you how many times that tag has been used). Without this functionality, I find myself staring blankly at the screen trying to work out what tags I would normally apply to an item.
Despite this minor flaw, Diigo definitely has one advantage over Delicious: the ability to highlight text on a web page. Many a time I have bookmarked a site due to a small passage on the page. The beauty of Diigo is that you can highlight the relevant passage for future relevance instead of having to scour the entire page at a later date, desperately trying to remember why you bookmarked the page in the first place. This is certainly a massive advantage over Delicious and one that has made Diigo a resource worthy of further investigation.
For now, I will reserve my judgement until I have had more time to play around with it. It certainly seems a useful tool, but to me it lacks Delicious’ simplicity (which may be a strength for many). Maybe in time I will ditch Delicious in favour of Diigo. At the moment I’m not so sure.