Aggregating multiple feeds with Universal Feed Parser
Here is already suggestion to store data in the database, e.g. bsddb.btopen() or any RDBMS.
Take a look at heapq.merge() and bisect.insort() or use one of B-tree implementations if you'd like to merge data in memory.
Having great luck working with single-source feed parsing in Universal Feed Parser, but now I need to run multiple feeds through it and generate chronologically interleaved output (not RSS). Seems like I'll need to iterate through URLs and stuff every entry into a list of dictionaries, then sort that by the entry timestamps and take a slice off the top. That seems do-able, but pretty expensive resource-wise (I'll cache it aggressively for that reason). 
Just wondering if there's an easier way - an existing library that works with feedparser to do simple aggregation, for example. Sample code?  Gotchas or warnings? Thanks.