After just 2 days, my initial feedback is overall positive - better to have something to improve on, than nothing at all - but I already see two problems.
The first is actually already on the Feature Voting list! It's simple. People are not patient enough to scroll through all the features. So the oldest proposals that were submitted first will show up at the top, and get the most votes. Even if you scroll page by page towards the bottom of the list, after a while you find out you have already spent your 10 votes, and never reach the ones on the bottom. And then you have to go back to see where you have allocated your votes...
This means that if you were lucky to propose things just minutes after the site was launched, you're at the top of the list, and the "first page suggestions" will struggle for dominance, while the rest stays at the bottom, despite being more important/more interesting. Not nice.
A better approach would be to have the lists classified according to type. As a default (ie. when you switch to the page at the beginning), you'll see the proposals you've voted on (including your own...), and their ranking in the overall list. Then you have to go specifically to a category first - say "avatar/attachments" - and only there will you see the ranking among that category. If you have enough categories, there may be a chance that all the proposals fit on a single page. And finally, get a "order by newest/oldest" and "order by rank". That way, different people will see different proposals - according to their interests - and it wouldn't be so "obvious" to vote just on the oldest and top-ranking proposals.
Also, I think that a link to a discussion place (forum, wiki...) should be mandatory and unique. This is to avoid people just dropping 50 times the same proposal to spread votes, and thus promote other proposals instead (imagine you see 50 proposals with "I want a Linux client!" Which will you pick for your voting?). Of course, that won't stop people to post "fake" discussion threads
but at least it will make it a bit more difficult. In one case, I tried to withdraw one of my own suggestions (which has been often discussed in the forums ) because I saw a similarly-worded proposal, but without a link for discussion. So I wasn't sure if I was talking about the same thing or not - I guess I was. Unfortunately, in the mean time, people have voted on my own proposal, and I couldn't "abandon" it any more
Now we have two different proposals for basically the same thing, and votes are being spread among both, keeping both very low on the priority list 
This is annoying and it should be addressed as well. I understand that re-editing the proposal should be made impossible, but at least it should be removable by the submitter, and all votes released (like what happens when a feature is approved by the Lindens).


