Just downloaded and installed Lektora Beta. Lektora is a new browser-based RSS aggregator.
I have been using Bloglines for a while now, and pretty satisfied with it. The main reason i like Bloglines is the fact that it lets me read blogs on any computer i use, without the need for installing any new software. Yet, as Lektora is also a browser-based aggregator, i decided to give this a try. Here is my initial impression.

Positives:
1) This has a very nice and polished look.
2) Available for both IE and Firefox.

Negatives:
1) Lektora requires you to download a 1.7 MB software to your machine.
2) Every time i try to read the blogs, Lektora takes time aggregating the feeds. This seems to take more time that i would like. With bloglines, this is really a snap.
3) Bloglines has a really nice feature in which it shows only the updated feeds since i last read a blog. Somehow i couldn't figure out how to do a similar thing in this tool.
4) There is no way for me to selectively delete a few blogs that i have added to the tool. Its painful when you try and delete the default blogs one by one.

Overall, Lektora beta doesn't have enough to cause a switch from Bloglines. Once they iron out the initial usability issues, may be this is worth a look.

Update: As the author of Lektora commented in the comments section, Item 3 is actually the default in which Lektora is installed. And Item 4 : Deleting a set of blogs is actually possible in Lektora.