I find http://www.sprymedia.co.uk/article/Design Design to be really handy when I'm making sure text line cadence is right. It's handy all around for design: powerful grid, rulers, measuring, and targeting tools.
http://westciv.com/xray/ XRAY keeps a spot on my bookmark bar. It's an HTML-traversing bookmarklet that lets me figure what's going on with underlying HTML and positioning CSS without leaving the page. It's been somewhat marginalized since Safari's Web Inspector started rocking so hard.
They; InstaPaper (also great); and Delicious/Facebook/Yahoo Bookmarks share/post bookmarklets are what currently dominate my bookmark bar.
i'm a little biased, but check out http://shifd.com/tools
similar to instapaper, delicious, etc in that you can bookmark links, but you can also do plain text (notes, addresses, recipes, etc). one use i like - you can highlight addresses on a page and click the bookmarklet which will save to shifd.com...then you can access the address+map on your phone.
In my view it is better than Google Reader's "note this" (followed by emailing). I say this because GmailThis! does not insert propaganda. It simply pastes the link and preps you to email to a friend.
Sorry for the plug, but it fits well :) Since I wrote Blummy, I have not changed it much, but IMO it is still useful. The database contains 400 bookmarklets to add to your own blummy.
I use TinyUrl and the Wikipedia bookmarklet more than any others: javascript:(function(){q=document.getSelection(); if(!q){void(q=prompt('Wikipedia keywords:',''))}; if(q)location.href='http://en.wikipedia.org/w/wiki.phtml?search='+escape(q)})()
Here's an amazon.com lookup one as well: javascript:void(q=prompt('Enter%20text%20to%20search%20Amazon.',getSelection()));if(q)void(location.href='http://www.amazon.com/exec/obidos/external-search/?keyword='...(q)+'&mode=blended&tag=blogography00-20&Go=Go')
http://westciv.com/xray/ XRAY keeps a spot on my bookmark bar. It's an HTML-traversing bookmarklet that lets me figure what's going on with underlying HTML and positioning CSS without leaving the page. It's been somewhat marginalized since Safari's Web Inspector started rocking so hard.
They; InstaPaper (also great); and Delicious/Facebook/Yahoo Bookmarks share/post bookmarklets are what currently dominate my bookmark bar.