Take Off Your Pants and Jacket and eponymous album

The band continued its commercial success with Take Off Your Pants and Jacket in 2001, which was a small change from their direction in Enema of the State. The album sold more than 350,000 copies in the first week. The album was released on three different CDs: yellow, red and green versions, each one featuring two unique bonus tracks. A European tour in winter 2001 was delayed in the aftermath of the September 11 attacks. Rescheduled dates in early 2002 were also canceled due to DeLonge's back problems.

Blink-182 co-headlined the Pop Disaster Tour with Green Day in 2002. The tour was documented on the DVD Riding in Vans with Boys. After taking some time off, DeLonge and Barker released a new album with their side-project Box Car Racer.
Recording of the band's next record began in early 2003. On November 18, 2003, Blink-182 released their eponymous fifth studio album, which spawned the hit singles "Feeling This," "I Miss You," "Down" and "Always." According to Barker, the album was supposed to represent a new Blink-182. A major change in theme and tone occurred that eschewed the juvenile singing and formulaic songwriting of past releases in favor of more conceptual, nuanced lyrics coupled with a darker, more experimental sound; their past foul-mouthed innuendo-filled writing was overtaken by a more serious, radio-friendly style. Robert Smith, whose band The Cure is often cited by Blink-182 as a major influence, appeared on "All of This."

During late 2003 through 2004 the band embarked on the memorable "DollaBill" tour, named for the inexpensive ticket costs which were originally planned to be completely free. A tour with No Doubt in the summer of 2004 was also very successful
Sources :http://en.wikipedia.org/wiki/Blink-182