It was offhandedly mentioned in last week's post about voting data, but thanks to an open-source contribution by ajbt200128 (whose Tildes username I don't know) there's now a page available for you to review posts you voted on recently. It's linked as "Your votes" in the sidebar menu when you're on your user page.
There's a warning at the top of the page about it, but please don't try to use that page to keep track of posts overall. Because the voting data is being deleted now, you won't be able to keep track of any posts older than 30 days through it. Use "Bookmark" for that—there's a link just above "Your votes" for "Your bookmarks" where bookmarked posts will stay forever.
I've also just noticed that these pages aren't paginated yet and everything's in one big list, so if you vote often, be warned that they might be quite large. I should probably work on fixing that now. Let me know if you notice any other issues with it.
And as usual, I've given everyone 10 invites, accessible on the invite page.